Macrophage inflammatory protein-4 (mip-4) polynucleotides

ABSTRACT

There are disclosed therapeutic compositions and methods using isolated nucleic acid molecules encoding a human myeloid progenitor inhibitory factor-1 (MPIF-1) polypeptide (previously termed MIP-3 and chemokine β8(CKβ8 or ckb-8)); a human monocyte-colony inhibitory factor (M-CIF) polypeptide (previously termed MIP1-γ and chemokine β1(CKβ1 or ckb-1)), and a macrophage inhibitory protein-4 (MIP-4), as well as MPIF-1, M-CIF and/or MIP-4 polypeptides themselves, as are vectors, host cells and recombinant methods for producing the same.

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application is a continuation-in-part of each of pendingapplication Ser. Nos.: 08/446,881 filed in the United States Patent andTrademark Office on May 5, 1995; 08/465,682 and 08/468,775, both filedon Jun. 6, 1995 in the United States Patent and Trademark Office. Eachof these applications are continuations-in-part of each of: applicationSer. No. 08/173,209 filed in the United States Patent and TrademarkOffice on Dec. 22, 1993; and application Ser. No. 08/208,339 filed inthe United States Patent and Trademark Office on Mar. 8, 1994, thecontents of which application are entirely incorporated herein byreference.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to novel chemokine polypeptides andencoding nucleic acids. More specifically, therapeutic compositions andmethods are provided using isolated nucleic acid molecules encoding ahuman myeloid progenitor inhibitory factor-1 (MPIF-1) polypeptide(previously termed MIP-3 and chemokine β8(CKβ8 or ckb-8)); a humanmonocyte-colony inhibitory factor (M-CIF) polypeptide (previously termedMIP 1-γ and chemokine β1 (CKβ1 or ckb-1)), and a macrophage inhibitoryprotein-4 (MIP-4), as well as MPIF-1, M-CIF and/or MIP-4 polypeptidesthemselves, as are vectors, host cells and recombinant methods forproducing the same.

[0004] 2. Related Art

[0005] Chemokines, also referred to as intercrine cytokines, are asubfamily of structurally and functionally related cytokines. Thesemolecules are 8-14 kd in size. In general chemokines exhibit 20% to 75%homology at the amino acid level and are characterized by four conservedcysteine residues that form two disulfide bonds. Based on thearrangement of the first two cysteine residues, chemokines have beenclassified into two subfamilies, alpha and beta. In the alpha subfamily,the first two cysteines are separated by one amino acid and hence arereferred to as the “C—X—C” subfamily. In the beta subfamily, the twocysteines are in an adjacent position and are, therefore, referred to asthe —C—C— subfamily. Thus far, at least eight different members of thisfamily have been identified in humans.

[0006] The intercrine cytokines exhibit a wide variety of functions. Ahallmark feature is their ability to elicit chemotactic migration ofdistinct cell types, including monocytes, neutrophils, T lymphocytes,basophils and fibroblasts. Many chemokines have proinflammatory activityand are involved in multiple steps during an inflammatory reaction.These activities include stimulation of histamine release, lysosomalenzyme and leukotriene release, increased adherence of target immunecells to endothelial cells, enhanced binding of complement proteins,induced expression of granulocyte adhesion molecules and complementreceptors, and respiratory burst. In addition to their involvement ininflammation, certain chemokines have been shown to exhibit otheractivities. For example, macrophage inflammatory protein I (MIP-1) isable to suppress hematopoietic stem cell proliferation, plateletfactor-4 (PF-4) is a potent inhibitor of endothelial cell growth,Interleukin-8 (IL-8) promotes proliferation of keratinocytes, and GRO isan autocrine growth factor for melanoma cells.

[0007] In light of the diverse biological activities, it is notsurprising that chemokines have been implicated in a number ofphysiological and disease conditions, including lymphocyte trafficking,wound healing, hematopoietic regulation and immunological disorders suchas allergy, asthma and arthritis. An example of a hematopoietic lineageregulator is MIP-1. MIP-1 was originally identified as anendotoxin-induced proinflammatory cytokine produced from macrophages.Subsequent studies have shown that MIP-1 is composed of two different,but related, proteins MIP-1α and MIP-1β. Both MIP-1α and MIP-1β arechemo-attractants for macrophages, monocytes and T lymphocytes.Interestingly, biochemical purification and subsequent sequence analysisof a multipotent stem cell inhibitor (SCI) revealed that SCI isidentical to MIP-1β. Furthermore, it has been shown that MIP-1 β cancounteract the ability of MIP-1α to suppress hematopoietic stem cellproliferation. This finding leads to the hypothesis that the primaryphysiological role of MIP-1 is to regulate hematopoiesis in bone marrow,and that the proposed inflammatory function is secondary. The mode ofaction of MIP-1α as a stem cell inhibitor relates to its ability toblock the cell cycle at the G₂S interphase. Furthermore, the inhibitoryeffect of MIP-1α seems to be restricted to immature progenitor cells andit is actually stimulatory to late progenitors in the presence ofgranulocyte macrophage-colony stimulating factor (GM-CSF).

[0008] Murine MIP-1 is a major secreted protein from lipopolysaccharidestimulated RAW 264.7, a murine macrophage tumor cell line. It has beenpurified and found to consist of two related proteins, MIP-1α andMIP-1β.

[0009] Several groups have cloned what are likely to be the humanhomologs of MIP-1α and MIP-1β. In all cases, cDNAs were isolated fromlibraries prepared against activated T-cell RNA.

[0010] MIP-1 proteins can be detected in early wound inflammation cellsand have been shown to induce production of IL-1 and IL-6 from woundfibroblast cells. In addition, purified native MIP-1 (comprising MIP-1,MIP-1α and MIP-1β polypeptides) causes acute inflammation when injectedeither subcutaneously into the footpads of mice or intracisternally intothe cerebrospinal fluid of rabbits (Wolpe and Cerami, 1989, FASEB J.3:2565-73). In addition to these proinflammatory properties of MIP-1,which can be direct or indirect, MIP-1 has been recovered during theearly inflammatory phases of wound healing in an experimental mousemodel employing sterile wound chambers (Fahey, et al. Cytokine, 2:92(1990)). For example, PCT application U.S. 92/05198 filed by ChironCorporation, discloses a DNA molecule which is active as a template forproducing mammalian macrophage inflammatory proteins (MIPs) in yeast.

[0011] The murine MIP-1α and MIP-1β are distinct but closely relatedcytokines. Partially purified mixtures of the two proteins affectneutrophil function and cause local inflammation and fever. MIP-1α hasbeen expressed in yeast cells and purified to homogeneity. Structuralanalysis confirmed that MIP-1α has a very similar secondary and tertiarystructure to platelet factor 4 (PF-4) and interleukin 8 (IL-8) withwhich it shares limited sequence homology. It has also been demonstratedthat MIP-1α is active in vivo to protect mouse stem cells fromsubsequent in vitro killing by tritiated thymidine. MIP-1α was alsoshown to enhance the proliferation of more committed progenitorgranulocyte macrophage colony-forming cells in response to granulocytemacrophage colony-stimulating factor. (Clemens, J. M. et al., Cytokine4:76-82 (1992)).

[0012] The polypeptides of the present invention, M-CIF originallyreferred to as MIP-1γ and Ckβ-1 in the parent patent application, is anew member of the β chemokine family based on amino sequence homology.The MPIF-1 polypeptide, originally referred to as MIP-3 and Ckβ-8 in theparent application, is also a new member of the β chemokine family basedon the amino acid sequence homology.

SUMMARY OF THE INVENTION

[0013] In accordance with one aspect of the present invention, there areprovided novel full length or mature polypeptides which are MPIF-1,MIP-4 and/or M-CIF, as well as biologically active, diagnosticallyuseful or therapeutically useful fragments, analogs and derivativesthereof. The MPIF-1, MIP-4 and M-CIF of the present invention arepreferably of animal origin, and more preferably of human origin.

[0014] In accordance with another aspect of the present invention, thereare provided polynucleotides (DNA or RNA) which encode such polypeptidesand isolated nucleic acid molecules encoding such polypeptides,including mRNAs, DNAs, cDNAs, genomic DNA as well as biologically activeand diagnostically or therapeutically useful fragments, analogs andderivatives thereof.

[0015] MPIF-1 Polynucleotides

[0016] The present invention also provides isolated nucleic acidmolecules comprising a polynucleotide encoding the MPIF-1 polypeptidehaving the amino acid sequence shown in FIG. 1 (SEQ ID NO:4) or theamino acid sequence encoded by the cDNA clone deposited in a bacterialhost as ATCC Deposit Number 75676 on Feb. 9, 1994. The nucleotidesequence determined by sequencing the deposited MPIF-1 clone, which isshown in FIG. 1 (SEQ ID NO:4), contains an open reading frame encoding apolypeptide of 120 amino acid residues, with a leader sequence of about21 amino acid residues, and a predicted molecular weight for the matureprotein of about 11 kDa in non-glycosylated form, and about 11-14 kDa inglycosylated form, depending on the extent of glycoslyation. The aminoacid sequence of the mature MPIF-1 protein is shown in FIG. 1, as aminoacid residues 22-120 of SEQ ID NO:4.

[0017] Thus, one aspect of the invention provides an isolated nucleicacid molecule comprising a polynucleotide having a nucleotide sequenceselected from the group consisting of: (1)(a) a nucleotide sequenceencoding an MPIF-1 polypeptide having the complete amino acid sequencein FIG. 1 (SEQ ID NO:4); (1)(b) a nucleotide sequence encoding themature MPIF-1 polypeptide having the amino acid sequence at positions22-120 in FIG. 1 (SEQ ID NO:4); (1)(c) a nucleotide sequence encodingthe MPIF-1 polypeptide having the complete amino acid sequence encodedby the cDNA clone contained in ATCC Deposit No. 75676; (1)(d) anucleotide sequence encoding the mature MPIF-1 polypeptide having theamino acid sequence encoded by the cDNA clone contained in ATCC DepositNo. 75676; and (1)(e) a nucleotide sequence complementary to any of thenucleotide sequences in (1)-(a), (b), (c) or (d) above.

[0018] M-CIF Polynucleotides

[0019] In one aspect, the present invention provides isolated nucleicacid molecules comprising a polynucleotide encoding the M-CIFpolypeptide having the amino acid sequence shown in FIG. 2 (SEQ ID NO:2)or the amino acid sequence encoded by the cDNA clone deposited in abacterial host as ATCC Deposit Number 75572 on Oct. 13, 1993. Thenucleotide sequence determined by sequencing the deposited M-CIF clone,which is shown in FIG. 2 (SEQ ID NO:2), contains an open reading frameencoding a polypeptide of 93 amino acid residues, with a leader sequenceof about 19 amino acid residues, and a predicted molecular weight ofabout 9 kDa in non-glycosylated form, and about 9-14 kDa in glycosylatedform, depending on the extent of glycoslyation. The amino acid sequenceof the mature M-CIF protein is shown in FIG. 2, as amino acid residues20-93 of SEQ ID NO:2.

[0020] Thus, one aspect of the invention provides an isolated nucleicacid molecule comprising a polynucleotide having a nucleotide sequenceselected from the group consisting of: (2)(a) a nucleotide sequenceencoding the M-CIF polypeptide having the complete amino acid sequencein FIG. 2 (SEQ ID NO:2); (2)(b) a nucleotide sequence encoding themature M-CIF polypeptide having the amino acid sequence at positions20-93 in FIG. 2 (SEQ ID NO:2); (2)(c) a nucleotide sequence encoding theM-CIF polypeptide having the complete amino acid sequence encoded by thecDNA clone contained in ATCC Deposit No. 75572; (2)(d) a nucleotidesequence encoding the mature M-CIF polypeptide having the amino acidsequence encoded by the cDNA clone contained in ATCC Deposit No.75572;and (2)(e) a nucleotide sequence complementary to any of the nucleotidesequences in (2)-(a), (b), (c) or (d) above.

[0021] MIP4 Polynucleotides

[0022] The present invention further provides isolated nucleic acidmolecules comprising a polynucleotide encoding the MIP-4 polypeptidehaving the amino acid sequence shown in FIG. 3 (SEQ ID NO:6) or theamino acid sequence encoded by the cDNA clone deposited in a bacterialhost as ATCC Deposit Number 75675 on Feb. 9, 1994. The nucleotidesequence determined by sequencing the deposited MIP-4 clone, which isshown in FIG. 3 (SEQ ID NO:6), contains an open reading frame encoding apolypeptide of 89 amino acid residues, with a leader sequence of about20 amino acid residues, and a predicted molecular weight of about 8 kDain non-glycosylated form, and about 8-14 kDa in glycosylated form,depending on the extent of glycoslyation. The amino acid sequence of themature MIP-4 protein is shown in FIG. 2, as amino acid residues 21-89 ofSEQ ID NO:6.

[0023] Another aspect of the invention provides an isolated nucleic acidmolecule comprising a polynucleotide having a nucleotide sequenceselected from the group consisting of: (3)(a) a nucleotide sequenceencoding the MIP-4 polypeptide having the complete amino acid sequencein FIG. 3 (SEQ ID NO:6); (3)(b) a nucleotide sequence encoding themature MIP-4 polypeptide having the amino acid sequence at positions25-89 in FIG. 3 (SEQ ID NO:6); (3)(c) a nucleotide sequence encoding theMIP-4 polypeptide having the complete amino acid sequence encoded by thecDNA clone contained in ATCC Deposit No.75675; (3)(d) a nucleotidesequence encoding the mature MIP-4 polypeptide having the amino acidsequence encoded by the cDNA clone contained in ATCC Deposit No. 75675;and (3)(e) a nucleotide sequence complementary to any of the nucleotidesequences in (3)-(a), (b), (c) or (d) above.

[0024] MPIF-1, M-CIF and MIP-4 Polynucleotide Variants

[0025] The present invention further relates to variants of thehereinabove described polynucleotides which encode for fragments,analogs and derivatives of the polypeptide having the deduced amino acidsequence of FIGS. 1, 2 and 3 (SEQ ID NOS:2, 4 and 6) or the polypeptidesencoded by the cDNA of the deposited clone(s). The variants of thepolynucleotides can be a naturally occurring allelic variant of thepolynucleotides or a non-naturally occurring variant of thepolynucleotides.

[0026] Homologous MPIF-1, M-CIF and MIP-4 Polynucleotides

[0027] Further embodiments of the invention include isolated nucleicacid molecules that comprise a polynucleotide having a nucleotidesequence at least 90% homologous or identical, and more preferably atleast 95%, 96%, 97%, 98% or 99% identical, to any of the nucleotidesequences in (1)-, (2)- or (3)-(a), (b), (c), (d) or (e), above, or apolynucleotide which hybridizes under stringent hybridization conditionsto a polynucleotide in (1)-, (2)- or (3)-(a), (b), (c), (d) or (e),above. These polynucleotides which hybridize do not hybridize understringent hybridization conditions to a polynucleotide having anucleotide sequence consisting of only A residues or of only T residues.

[0028] Nucleic Acid Probes

[0029] In accordance with yet another aspect of the present invention,there are also provided nucleic acid probes comprising nucleic acidmolecules of sufficient length to specifically hybridize to the MPIF-1,M-CIF and/or MIP-4 nucleic acid sequences.

[0030] Recombinant Vectors, Host Cells and Expression

[0031] The present invention also relates to recombinant vectors, whichinclude the isolated nucleic acid molecules of the present invention,and to host cells containing the recombinant vectors, as well as tomethods of making such vectors and host cells and for using them forproduction of MPIF-1, M-CIF or MIP-4 polypeptides or peptides byrecombinant techniques.

[0032] MPIF-1 Polypeptides

[0033] The invention further provides an isolated MPIF-1 polypeptidehaving an amino acid sequence selected from the group consisting of:(I)(a) the amino acid sequence of the MPIF-1 polypeptide having thecomplete 120 amino acid sequence, including the leader sequence shown inFIG. 1 (SEQ ID NO:4); (1)(b) the amino acid sequence of the matureMPIF-1 polypeptide (without the leader) having the amino acid sequenceat positions 22-120 in FIG. 1 (SEQ ID NO:4); (I)(c) the amino acidsequence of the MPIF-1 polypeptide having the complete amino acidsequence, including the leader, encoded by the cDNA clone contained inATCC Deposit No. 75676; and (I)(d) the amino acid sequence of the matureMPIF-1 polypeptide having the amino acid sequence encoded by the cDNAclone contained in ATCC Deposit No.75676.

[0034] M-CIF Polypeptides

[0035] The invention further provides an isolated M-CIF polypeptidehaving an amino acid sequence selected from the group consisting of:(II)(a) the amino acid sequence of the M-CIF polypeptide having thecomplete 93 amino acid sequence, including the leader sequence shown inFIG. 2 (SEQ ID NO:2); (II)(b) the amino acid sequence of the matureM-CIF polypeptide (without the leader) having the amino acid sequence atpositions 20-93 in FIG. 2 (SEQ ID NO:2); (II)(c) the amino acid sequenceof the M-CIF polypeptide having the complete amino acid sequence,including the leader, encoded by the cDNA clone contained in ATCCDeposit No. 75572; and (II)(d) the amino acid sequence of the matureM-CIF polypeptide having the amino acid sequence encoded by the cDNAclone contained in ATCC Deposit No. 75572.

[0036] MIP-4 Polypeptides

[0037] The invention further provides an isolated MIP-4 polypeptidehaving an amino acid sequence selected from the group consisting of:(III)(a) the amino acid sequence of the MIP-4 polypeptide having thecomplete 89 amino acid sequence, including the leader sequence shown inFIG. 3 (SEQ ID NO:6); (III)(b) the amino acid sequence of the matureMIP-4 polypeptide (without the leader) having the amino acid sequence atpositions 21-89 in FIG. 3 (SEQ ID NO:6); (III)(c) the amino acidsequence of the MIP-4 polypeptide having the complete amino acidsequence, including the leader, encoded by the cDNA clone contained inATCC Deposit No. 75675; and (III)(d) the amino acid sequence of themature MIP-4 polypeptide having the amino acid sequence encoded by thecDNA clone contained in ATCC Deposit No. 75675.

[0038] Homologous MPIF-, M-CIF and MIP-4 Polypeptides

[0039] Polypeptides of the present invention also include homolgouspolypeptides having an amino acid sequence with at least 90% identity,and more preferably at least 95% identity to those described in (I)-,(II)- and (III)(a), (b), (c) or (d) above, as well as polypeptideshaving an amino acid sequence at least 80% identical, more preferably atleast 90% identical, and still more preferably 95%, 96%, 97%, 98% or 99%identical to those above.

[0040] MPIF-1, M-CIF and MIP-4 Epitope Bearing Polypeptides and EncodingPolynucleotides

[0041] An additional embodiment of this aspect of the invention relatesto a peptide or polypeptide which has the amino acid sequence of anepitope-bearing portion of an MPIF-1, M-CIF or MIP-4 polypeptide havingan amino acid sequence described in (I)-, (II)-, or (III)- (a), (b), (c)or (d), above. Peptides or polypeptides having the amino acid sequenceof an epitope-bearing portion of an MPIF-1, M-CIF or MIP-4 polypeptideof the invention include portions of such polypeptides with at least sixor seven, preferably at least nine, and more preferably at least about30 amino acids to about 50 amino acids, although epitope-bearingpolypeptides of any length up to and including the entire amino acidsequence of a polypeptide of the invention described above also areincluded in the invention.

[0042] An additional nucleic acid embodiment of the invention relates toan isolated nucleic acid molecule comprising a polynucleotide whichencodes the amino acid sequence of an epitope-bearing portion of anMPIF-1, M-CIF or MIP-4 polypeptide having an amino acid sequence in(I)-, (II)- or (III)-(a), (b), (c) or (d), above.

[0043] MPIF-1, M-CIF and MIP-4 Antibodies

[0044] In accordance with yet a further aspect of the present invention,there is provided an antibody against such polypeptides. In anotherembodiment, the invention provides an isolated antibody that bindsspecifically to an MPIF-1, M-CIF or MIP-4 polypeptide having an aminoacid sequence described in (I)-, (II)-, and/or (III)- (a), (b), (c) or(d) above.

[0045] The invention further provides methods for isolating antibodiesthat bind specifically to an MPIF-1, M-CIF or MIP-4 polypeptide havingan amino acid sequence as described herein. Such antibodies are usefuldiagnostically or therapeutically as described below.

[0046] MPIF-1, M-CIF and MIP-4 Antagonists and Methods

[0047] In accordance with yet another aspect of the present invention,there are provided antagonists or inhibitors of such polypeptides, whichcan be used to inhibit the action of such polypeptides, for example, inthe treatment of arteriosclerosis, autoimmune and chronic inflammatoryand infective diseases, histamine-mediated allergic reactions,hyper-eosinophilic syndrome, silicosis, sarcoidosis, inflammatorydiseases of the lung, inhibition of IL-1 and TNF, aplastic anaemia, andmyelodysplastic syndrome. Alternatively, such polypeptides can be usedto inhibit production of IL-1 and TNF-α, to treat aplastic anemia,myelodysplastic syndrome, asthma and arthritis.

[0048] Diagnostic Assays

[0049] In accordance with still another aspect of the present invention,there are provided diagnostic assays for detecting diseases related tothe underexpression and overexpression of the polypeptides and fordetecting mutations in the nucleic acid sequences encoding suchpolypeptides.

[0050] In accordance with yet another aspect of the present invention,there is provided a process for utilizing such polypeptides, orpolynucleotides encoding such polypeptides, as research reagents for invitro purposes related to scientific research, synthesis of DNA andmanufacture of DNA vectors, for the purpose of developing therapeuticsand diagnostics for the treatment of human disease.

[0051] The present invention also provides a screening method foridentifying compounds capable of enhancing or inhibiting a cellularresponse induced by an MPIF-1, M-CIF or MIP-4 polypeptide, whichinvolves contacting cells which express the MPIF-1, M-CIF or MIP-4polypeptide with the candidate compound, assaying a cellular response,and comparing the cellular response to a standard cellular response, thestandard being assyed when contact is made in absence of the candidatecompound; whereby, an increased cellular response over the standardindicates that the compound is an agonist and a decreased cellularresponse over the standard indicates that the compound is an antagonist.

[0052] For a number of disorders, it is believed that significantlyhigher or lower levels of MPIF-1, M-CIF or MIP-4 gene expression can bedetected in certain tissues or bodily fluids (e.g., serum, plasma,urine, synovial fluid or spinal fluid) taken from an individual havingsuch a disorder, relative to a “standard” MPIF-1, M-CIF or MIP-4 geneexpression level, i.e., the MPIF-1, M-CIF or MIP-4 expression level intissue or bodily fluids from an individual not having the disorder.Thus, the invention provides a diagnostic method useful during diagnosisof a disorder, which involves: (a) assaying MPIF-1, M-CIF or MIP4 geneexpression level in cells or body fluid of an individual; (b) comparingthe MPIF-1, M-CIF or MIP-4 gene expression level with a standard MPIF-1,M-CIF or MIP4 gene expression level, whereby an increase or decrease inthe assayed MPIF-1, M-CIF or MIP-4 gene expression level compared to thestandard expression level is indicative of a disorder. Such disordersinclude leukemia, chronic inflammation, autoimmune diseases, solidtumors.

[0053] Pharmaceutical Compositions

[0054] The present invention also provides, in another aspect,pharmaceutical compositions comprising at least one of an MPIF-1, M-CIFor MIP-4: polynucleotide, probe, vector, host cell, polypeptide,fragment, variant, derivative, epitope bearing portion, antibody,antagonist, agonist,

[0055] Therapeutic Methods

[0056] In accordance with yet a further aspect of the present invention,there is provided a process for utilizing such polypeptides, orpolynucleotides encoding such polypeptides for therapeutic purposes, forexample, to protect bone marrow stem cells from chemotherapeutic agentsduring chemotherapy, to remove leukemic cells, to stimulate an immuneresponse, to regulate hematopoiesis and lymphocyte trafficking,treatment of psoriasis, solid tumors, to enhance host defenses againstresistant and acute and chronic infection, and to stimulate woundhealing.

[0057] An additional aspect of the invention is related to a method fortreating an individual in need of an increased level of MPIF-1, M-CIF orMIP-4 activity in the body comprising administering to such an indivduala composition comprising a therapeutically effective amount of anisolated MPIF-1, M-CIF or MIP-4 polypeptide of the invention or anagonist thereof, respectively.

[0058] A still further aspect of the invention is related to a methodfor treating an individual in need of a decreased level of MPIF-1, M-CIFor MIP4 activity in the body comprising, administering to such anindividual a composition comprising a thereapeutically effective amountof an MPIF-1, M-CIF or MIP-4 antagonist. Preferred antagonists for usein the present invention are M-CIF-specific antibodies, respectively.

[0059] These and other aspects of the present invention should beapparent to those skilled in the art from the teachings herein.

BRIEF DESCRIPTION OF THE FIGURES

[0060] The following drawings are illustrative of embodiments of theinvention and are not meant to limit the scope of the invention asencompassed by the claims.

[0061]FIG. 1 displays the cDNA sequence encoding MPIF-1 and thecorresponding deduced amino acid sequence. The initial 21 amino acidsrepresents the putative leader sequence. All the signal sequences wereas determined by N-terminal peptide sequencing of the baculovirusexpressed protein.

[0062]FIG. 2 displays the cDNA sequence encoding M-CIF and thecorresponding deduced amino acid sequence. The initial 19 amino acidsrepresents a leader sequence.

[0063]FIG. 3 displays the cDNA sequence encoding MIP-4 and thecorresponding deduced amino acid sequence. The initial 20 amino acidsrepresents a leader sequence.

[0064]FIG. 4 illustrates the amino acid homology between MPIF-1 (top)and human MIP-1α (bottom). The four cysteines characteristic of allchemokines are shown.

[0065]FIG. 5 displays two amino acid sequences wherein, the top sequenceis the human MIP-4 amino acid sequence and the bottom sequence is humanMIP-1α (Human Tonsillar lymphocyte LD78 Beta protein precursor).

[0066]FIG. 6 illustrates the amino acid sequence alignment between M-CIF(top) and human MIP-1α (bottom).

[0067]FIG. 7 is a photograph of a gel in which M-CIF has beenelectrophoresed after the expression of HA-tagged M-CIF in COS cells.

[0068]FIG. 8 is a photograph of a SDS-PAGE gel after expression andpurification of M-CIF in a baculovirus expression system.

[0069]FIG. 9 is a photograph of an SDS-PAGE gel after expression and athree-step purification of MPIF-1 in a baculovirus expression system.

[0070]FIG. 10. The chemoacttractant activity of MPIF-1 was determinedwith chemotaxis assays using a 48-well microchamber device (Neuro Probe,Inc.). The experimental procedure was as described in the manufacturersmanual. For each concentration of MPIF-1 tested, migration in 5high-power fields was examined. The results presented represent theaverage values obtained from two independent experiments. Thechemoacttractant activity on THP-1 (A) cells and human PBMCs (B) isshown.

[0071]FIG. 11. Change in intracellular calcium concentration in responseto MPIF-1 was determined using a Hitachi F-2000 fluorescencespectrophotometer. Bacterial expressed MPIF-1 was added to Indo-1 loadedTHP-1 cells to a final concentration of 50 nM and the intracellularlevel of calcium concentration was monitored.

[0072]FIG. 12. A low density population of mouse bone marrow cells wasplated (1,500 cells/dish) in agar containing-medium with or without theindicated chemokines (100 ng/ml), but in the presence of IL-3 (5 ng/ml),SCF (100 ng/ml), IL-1α (10 ng/ml), and M-CSF (5 ng/ml). The data shownrepresents the average obtained from two independent experiments (eachperformed in duplicate). Colonies were counted 14 days after plating.The number of colonies generated in the presence of chemokines isexpressed as a mean percentage of those produced in the absence of anyadded chemokines.

[0073]FIG. 13 illustrates the effect of MPIF-1 and M-CIF on mouse bonemarrow colony formation by HPP-CFC (A) and LPP-CFC (B).

[0074]FIG. 14 illustrates the effect of baculovirus-expressed M-CIF andMPIF-1 on M-CFS and SCF-stimulated colony formation of freshly isolatedbone marrow cells.

[0075]FIG. 15 illustrates the effect of MPIF-1 and M-CIF on IL3 andSCF-stimulated proliferation and differentiation of the lin⁻ populationof bone marrow cells.

[0076]FIG. 16. Effect of MPIF-1 and M-CIF on the generation of Gr.1 andMac-1 (surface markers) positive population of cells from lineagedepleted population of bone marrow cells. lin⁻ cells were incubated ingrowth medium supplemented with IL-3 (5 ng/ml) and SCF (100 ng/ml) alone(a) or with: M-CIF (50 ng/ml) (b) or M-CIF (50 ng/ml) (c). Cells werethen stained with Monoclonal antibodies against myeloid differentiationGr.1, Mac-1, Sca-1, and CD45R surface antigens and analyzed by FACScan.Data is presented as percentage of positive cells in both large (A) andsmall (B) cell populations.

[0077]FIG. 17 illustrates that the presence of MPIF-1 protein inhibitsbone marrow cell colony formation in response to IL3, M-CSF and GM-CSF.

[0078]FIG. 18. Dose response of MPIF-1 inhibits bone marrow cell colonyformation. Cells were isolated and treated as in FIG. 19. The treatedcells were plated at a density of 1,000 cells/dish in agar-based colonyformation assays in the presence of IL-3, GM-CSF or M-CSF (5 ng/ml) withor without MPIF-1 at 1, 10, 50 and 100 ng/ml. The data is presented ascolony formation as a percentage of the number of colonies formed withthe specific factor alone. The data is depicted as the average ofduplicate dishes with error bars indicating the standard deviation.

[0079]FIG. 19. Expression of RNA encoding MPIF-1 in human monocytes.Total RNA from fresh elutriated monocytes was isolated and treated with100 U/ml hu rIFN-g, 100 ng/ml LPS, or both. RNA (8 μg) from eachtreatment was separated electrophoretically on a 1.2% agarose gel andtransferred to a nylon membrane. MPIF-1 mRNA was quantified by probingwith ³²P-labeled cDNA and the bands on the resulting autoradiograph werequantified densitometrically.

[0080] FIGS. 20A-B.

[0081]FIG. 20A shows an analysis of the MPIF-1 amino acid sequence.Alpha, beta, turn and coil regions; hydrophilicity and hydrophobicity;amphipathic regions; flexible regions; antigenic index and surfaceprobability are shown. In the “Antigenic Index—Jameson-Wolf” graph,amino acid residues 21-30, 31-44, 49-55, 59-67, 72-83, 86-103 and110-120, or any range or value therein, in FIG. 1 (SEQ ID NO: 4)correspond to the shown highly antigenic regions of the MPIF-1 protein.

[0082]FIG. 20B shows an analysis of the M-CIF amino acid sequence.Alpha, beta, turn and coil regions; hydrophilicity and hydrophobicity;amphipathic regions; flexible regions; antigenic index and surfaceprobability are shown. In the “Antigenic Index—Jameson-Wolf” graph,amino acid residues 20-36, 42-52, 52-64, 67-75, 75-84 and/or 86-93, orany range or value therein, in FIG. 2 (SEQ ID NO:2) correspond to theshown highly antigenic regions of the M-CIF protein.

[0083] FIGS. 21A-B.

[0084]FIG. 21A shows the myeloprotective effect of MPIF-1 on the5-Fu-induced killing of LPP-CFC cells.

[0085]FIG. 21B shows the myeloprotective effect of MPIF-1 on the Ara-Cinduced killing of LPP-CFC cells.

[0086]FIG. 22 shows the effect of MPIF-1 pre-treatment of mice on the5-Fu-induced reduction in the circulating WBC counts.

[0087]FIG. 23 shows the experimental design involving three groups ofmice (6 animals per group) that were treated as follows: Group-1,injected with saline on days 1, 2, and 3; Group-2, injected with 5-Fu ondays 0 and 3; and Group-3, injected with 5-Fu on days 0 and 3 and MPIF-1on days 1,2, and 3. Bone marrow was harvested on days 6 and 9 todetermine HPP-CFC and LPP-CFC frequencies using a clonogenic assay.

[0088]FIG. 24 shows the effect of administration of MPIF-1 prior to thesecond dose of 5-Fu on the HPP-CFC and LPP-CFC frequencies in the bonemarrow.

[0089]FIG. 25 shows MPIF-1 variants. The first 80 out of 120 amino acidssequence of MPIF-1 (FIG. 1) is shown using a single amino acid lettercode of which the first 21 residues show characteristics of a signalsequence that is cleaved to give rise to a mature, wild type protein.Mutants 1 and 6 contain methionine as the N-terminal residue which isnot present in the wild type. Also, the first four amino acids (HAAG) ofMutant-10 are not present in the wild type MPIF-1 protein.

[0090] FIGS. 26A-B.

[0091]FIG. 26A shows the nucleotide sequence of the human MPIF-1 splicedvariant ( Mutant-9) cDNA is shown along with the open reading frameencoding for a protein of 137 amino acids using a single letter aminoacid code. The N-terminal 21 amino acids which are underlined representthe putative leader sequence. The insertion of 18 amino acids sequencenot represented in the MPIF-1 sequence but unique to the this splicedvariant is high-lighted in italics.

[0092]FIG. 26B shows the comparison of the amino acid sequence of theMPIF-1 variant with that of the wild type MPIF-1 molecule.

[0093]FIG. 27 shows the concentrations of MPIF-1 mutant proteinsrequired for 50% of maximal calcium mobilization response induced byMIP-1α in human monocytes.

[0094]FIG. 28 shows the changes in the intracellular free calciumconcentration was measured in human monocytes in response to theindicated proteins at 100 ng/ml as described in the legend to FIG. 27.

[0095]FIG. 29 shows the ability of MPIF-1 mutants to desensitize MIP-1astimulated calcium mobilization in human monocytes (summary).

[0096]FIG. 30 shows the chemotactic responses of human peripheral bloodmononuclear cells (PBMC) to MPIF-1 mutants. Numbers within theparenthesis reflect fold stimulation of chemotaxis above backgroundobserved at the indicate contentration range.

[0097]FIG. 31 shows the effect of MPIF-1 variants on the growth anddifferentiation of Low Proliferative Potential Colony-forming Cells (LPP-CFC ) in vitro.

[0098]FIG. 32 shows protection against LPS-induced septic shock in miceby pretreatment with recombinant human M-CIF. Groups of Balb/c mice(n=7) were injected i.p. with 25 mg/kg of LPS on day 0. M-CIF was giveni.p. daily at 3 mg/kg of body weight of for 3 consecutive days from oneday before, on the same day, and one day after LPS challenge (−1, 0,+1). Mice recieving buffer only served as disease control. The kineticof lethality was followed for 56 hours after LPS challenge.

[0099]FIG. 33 shows the protective effect of M-CIF on lethal shock isdependent on LPS dose. Groups of Balb/c mice (n=9) were injected i.p.with 25 mg/kg of LPS on day 0 for different degrees of sepsis induction.10 mg/kg of M-CIF was given i.p. daily for 3 consecutive day to eachgroup of LPS-treated mice. The kinetic of lethality was followed for 56hours after LPS challenge.

[0100]FIG. 34 shows protection against LPS-induced lethal shock in miceis dependent on M-CIF dose. Groups of Balb/c mice (n=8) were challengedi.p. with 25 mg/kg of LPS on day 0 and treated daily with differentdoses (1, 3 or 10 mg/kg) of M-CIF for 3 consecutive days (−1, 0, +1).Mice receiving buffer only served as a disease control. The kinetic oflethality was followed for 120 hours after LPS challenge.

[0101] FIGS. 35A-B shows the protective effect of M-CIF on LPS-inducedshock in Balb/c SCID mice. Groups of Balb/c SCID mice (n=5-7) werechallenged i.p. with 20, 30 or 40 mg/kg of LPS on day 0; and M-CIFtreatment was given to each group of LPS-injected mice at 3 mg/kg dailydosing for 3 consecutive days (−1, 0, +1). The kinetic of lethality wasfollowed for 120 hours after LPS challenge. The result of M-CIFpretreatment on 20 mg/kg of LPS-injected mice is the same as that ofLPS-injection alone with no death occuring.

[0102]FIG. 36 shows the protective effect of M-CIF protein from E. Coliand CHO expression vectors on sepsis. Groups of Balb/c mice (n=8) wereinjected with 25 mg/kg of LPS on day 0; and treated with two differentbatches (E1 and C1) of M-CIF at 1 mg/kg for 3 consecutive days (−1, 0,+1). Mice receiving buffer only served as a disease control. The kineticof lethality was followed for 120 hours after LPS challenge.

[0103]FIG. 37. Efficacy of M-CIF in reducing paw edema inadjuvant-induced arthritis model. Groups of Lewis rats (n=5) wereinjected intradermally at the base of the tail with 100[t1/rat ofFreund's complete adjuvant containing 5 mg/ml Mycobacterium butyricum onday 0. Preventative treatment started on day 0 and continued daily (M-F,5 times/week) fo 16 days with i.p. M-CIF at 1 or 3 m2/kL—in buffer (40mM sodium acetate; 500 mM NACI) or with p.o. indomethacin at 1 mg/kg inmethyl cellulose, as drug control, daily dose (5 times/week) for 16days. Rats receiving buffer or methyl cellulose only served as diseasecontrol. Swelling of both hind paws were monitored on the days asindicated using a plethysmometer chamber, and percentage of efficacy oftesting drugs on paw volume were calculated.

[0104]FIG. 38. Protective effect of M-CIF on total joint inflammation.At the end of the same experiment as FIG. 40, which was 40 days afteradjuvant immunization, both hind limbs from two rats per group werecollected for histopathological analysis. The results are expressed asmean of total histological score.

[0105]FIG. 39. Protective effect of M-CIF on chronic features ofarthritis. A similar experiment as FIG. 40 with prolonged dailytreatment of M-CIF or indomethacin to 40 days post adjuvantimmunization, was conducted to further analyze chronic histopathologicalchanges including hypertrophy, fibrosis, blood vessel dilation andlymphoid aggregates around blood vessels. The results were expressed asmean (n=5) of the total features mentioned above. An unpaired T test wasemployed for obtaining assessing statistical significance.

[0106]FIG. 40. Protective effect of M-CIF on bone and cartilage erosion.In the same experiment as FIG. 39, pannus formation, bone and cartilagedestruction were evaluated. The results were expressed as mean (n=5) ofthe total features mentioned above. An unpaired T test was employed forassessing statistical significance.

[0107]FIG. 41. M-CIF treatment prevents developing type 11collagen-induced arthritis in DBA/I mice. Female DBA/ilacJ mice wereimmunized i.d. at the base of the tail with Bovine type 11 collagenemulsified in complete Freund's adjuvant. 20 days later, the mice werechallenged with a s.c. injection of 60 mg/100 of LPS. Two days precedingLPS injection, 3 groups of animals (n=10 per group) were i.p. treatedwith 3 mg/ml of indomethacin, M-CIF, or their buffer controlsrespectively. These treatments continued daily for 14 days. The animalswere examined and their clinical presentation semiquantified. The %incidence is shown in this FIG.

[0108]FIG. 42 Animals were immunized with bovine type II collagen asdescribed in FIG. 44. The results are expressed as the mean severity.

[0109]FIG. 43 shows the suppressive effect of M-CIF on systemic TNF-Aproduction. Groups of female Balb/c mice were challenged with 25 mg/kgof lipopolysaccharide (LPS) from E. coli serotype 0127:B8 (Sigma) insaline on Day 0. M-CIF or buffer was administered one day before and thesame day (I hour before) of LPS injection. Serum was collected atvarious time points after LPS administration and the TNF-A leveldetermined. The results were analyzed with an unpaired T test and thedata expressed as the mean±SEM.

[0110]FIG. 44 shows the decrease in TNF-(a production from peritonealcells isolated from M-CIF treated mice. Mice were treated with M-CIF at3 mg/kg for two days. One hour after the second M-CIF injection, theperitoneal cells were harvested and put into culture to assay forcytokine production in the presence or absence of LPS. TNF-(X levelswere measured by ELISA.

[0111]FIG. 45 shows the increased total cell number in the peritonealcavity of M-CIF treated mice. Mice were untreated, treated with vehiclecontrol or treated with M-CIF at I mg/kg and 3 mg/kg dayly for sixconsecutive days. On the seventh day, mice were sacrificed and theperitoneal cells harvested and quantitated.

[0112]FIG. 46 shows the specific increase in CD4 positive T-lymphocytesin the peritoneal cavity of M-CIF treated mice. Mice were treated asdescribed in FIG. 48. Each animal is represented by a different symbolfrom the untreated, vehicle treated, 1 mg/kg M-CIF, and 3 mg/kg M-CIFgroups. Each group contained 10 animals each, with the cells from eachanimal analyzed by cell surface staining using antibodies directed atCD4, CD5, CD8, Macl, MHC class II, B220, IgM, Gr I and CD 14.

[0113]FIG. 47 shows an increase in total T-lymphocyte cell numbers(CD5/IgM−, CD4, and CD8) in the peritoneal cavity of M-CIF treated mice.

[0114]FIG. 48 shows a decrease in the percentage of Macl+/MHC class II+cells in the peritoneal cavity of M-CIF treated mice with acorresponding increase in the percentage of of Macl+/MHC class IIcells.

[0115]FIG. 49 shows an increase in the total number of Macl+/MHC classII-cells in the peritoneal cavity of M-CIF treated mice.

[0116]FIG. 50 shows the stem cell mobilization in normal mice inresponse to the administration of MPIF-1.

DESCRIPTION OF EMBODIMENTS

[0117] The present invention provides diagnostic or therapeuticcompositions and methods that utilize isolated polynucleotide moleculesencoding polypeptides, or the polypeptides themselves, as: (i) a humanmonocyte-colony inhibitory factor (M-CIF) polypeptides (previouslytermed MIP1-γ and chemokine β1(CKβ1 or ckb-1)); (ii) human myeloidprogenitor inhibitory factor-1 (MPIF-1) polypeptides (previously termedMIP-3 and chemokine β8(CKβ8 or ckb-8)); and/or (iii) macrophageinhibitory protein-4 (MIP-4), as are vectors, host cells and recombinantor synthetic methods for producing the same.

[0118] MPIF-1, M-CIF and MIP-4 Polynucleotides

[0119] In accordance with an aspect of the present invention, there areprovided isolated nucleic acids (polynucleotides) which encode for thefull-length or mature MPIF-1, M-CIF or MIP-4 polypeptide having thededuced amino acid sequence of, respectively, FIGS. 1, 2 or 3 (SEQ IDNOS:2, 4 and 6) and for the mature MPIF-1 polypeptide encoded by thecDNA of the clone(s) deposited as ATCC Deposit No. 75676 on Feb. 9,1994, and for the mature MIP-4 polypeptide encoded by the cDNA of theclone depsoited as ATCC Deposit No. 75675 on Feb. 9, 1994 and for themature M-CIF polypeptide encoded by the cDNA of the clone deposited asATCC no. 75572, deposited on Oct. 13, 1993. The address of the AmericanType Culture Collection is 12301 Park Lawn Drive, Rockville, Md. 20852.The deposited clones are contained in the pBluescript SK(−) plasmid(Stratagene, LaJolla, Calif.).

[0120] The deposit(s) referred to herein will be maintained under theterms of the Budapest Treaty on the International Recognition of theDeposit of Micro-Organisms for Purposes of Patent Procedure. Thesedeposits are provided merely as convenience to those of skill in the artand are not an admission that a deposit is required under 35 U.S.C.§112. The sequence of the polynucleotides contained in the depositedmaterials, as well as the amino acid sequence of the polypeptidesencoded thereby, are incorporated herein by reference and arecontrolling in the event of any conflict with description of sequencesherein. A license can be required to make, use or sell the depositedmaterials, and no such license is hereby granted.

[0121] Polynucleotides encoding polypeptides of the present inventionare structurally related to the pro-inflammatory supergene “intercrine”which is in the cytokine or chemokine family. Both MPIF-1 and MIP-4 areM-CIF homologues and are more homologous to MIP-1α than to MIP-1β. Thepolynucleotide encoding for MPIF-1 was derived from an aorticendothelium cDNA library and contains an open reading frame encoding apolypeptide of 120 amino acid residues, which exhibits significanthomology to a number of chemokines. The top match is to the humanmacrophage inflammatory protein 1 alpha, showing 36% identity and 66%similarity (FIG. 4).

[0122] The polynucleotide encoding MIP-4 was derived from a human adultlung cDNA library and contains an open reading frame encoding apolypeptide of 89 amino acid residues, which exhibits significanthomology to a number of chemokines. The top match is to the humantonsillar lymphocyte LD78 beta protein, showing 60% identity and 89%similarity (FIG. 5). Furthermore, the four cysteine residues occurringin all chemokines in a characteristic motif are conserved in bothclone(s). The fact that the first two cysteine residues in the genes arein adjacent positions classifies them as “C—C” or β subfamily ofchemokines. In the other subfamily, the “CXC” or α subfamily, the firsttwo cysteine residues are separated by one amino acid.

[0123] The polynucleotide encoding from M-CIF contains and open readingframe encoding a polypeptide of 93 amino acids, of which the first about19 are a leader sequence such that the mature peptide contains about 74amino acid residues. M-CIF exhibits significant homology to humanmacrophage inhibitory protein-α, with 48% identity and 72% similarityover a stretch of 80 amino acids. Further, the four cysteine residuescomprising a characteristic motif are conserved.

[0124] The polynucleotides of the present invention can be in the formof RNA or in the form of DNA, which DNA includes cDNA, genomic DNA, andsynthetic DNA. The DNA can be double-stranded or single-stranded, and ifsingle stranded can be the coding strand or non-coding (anti-sense)strand. The coding sequence which encodes the mature polypeptides can beidentical to the coding sequence shown in FIGS. 1, 2 and 3 (SEQ ID NOS:1, 3 and 5, respectively) or that of the deposited clone(s) or can be adifferent coding sequence which coding sequence, as a result of theredundancy or degeneracy of the genetic code, encodes the same, maturepolypeptides as the DNA of FIGS. 1, 2 and 3 (SEQ ID NOS: 1, 3 and 5) orthe deposited cDNAs.

[0125] The polynucleotides which encode for the mature polypeptides ofFIGS. 1, 2 and 3 (SEQ ID NOS: 2, 4, 6) or for the mature polypeptidesencoded by the deposited CDNA can include: only the coding sequence forthe mature polypeptide; the coding sequence for the mature polypeptidesand additional coding sequence such as a leader or secretory sequence ora proprotein sequence; the coding sequence for the mature polypeptides(and optionally additional coding sequence) and non-coding sequence,such as introns or non-coding sequence 5′ and/or 3′ of the codingsequence for the mature polypeptides.

[0126] Thus, the term “polynucleotide encoding a polypeptide”encompasses a polynucleotide which includes only coding sequence for thepolypeptide as well as a polynucleotide which includes additional codingand/or non-coding sequence.

[0127] Unless otherwise indicated, all nucleotide sequences determinedby sequencing a DNA molecule herein were determined using an automatedDNA sequencer (such as the Model 373 from Applied Biosystems, Inc.), andall amino acid sequences of polypeptides encoded by DNA moleculesdetermined herein were predicted by translation of a DNA sequencedetermined as above. Therefore, as is known in the art for any DNAsequence determined by this automated approach, any nucleotide sequencedetermined herein may contain some errors. Nucleotide sequencesdetermined by automation are typically at least about 90% identical,more typically at least about 95% to at least about 99.9% identical tothe actual nucleotide sequence of the sequenced DNA molecule. The actualsequence can be more precisely determined by other approaches includingmanual DNA sequencing methods well known in the art. As is also known inthe art, a single insertion or deletion in a determined nucleotidesequence compared to the actual sequence will cause a frame shift intranslation of the nucleotide sequence such that the predicted aminoacid sequence encoded by a determined nucleotide sequence will becompletely different from the amino acid sequence actually encoded bythe sequenced DNA molecule, beginning at the point of such an insertionor deletion.

[0128] Unless otherwise indicated, each “nucleotide sequence” set forthherein is presented as a sequence of deoxyribonucleotides (abbreviatedA, G, C and T). However, by “nucleotide sequence” of a nucleic acidmolecule or polynucleotide is intended, for a DNA molecule orpolynucleotide, a sequence of deoxyribonucleotides, and for an RNAmolecule or polynucleotide, the corresponding sequence ofribonucleotides (A, G, C and U), where each thymidinedeoxyribonucleotide (T) in the specified deoxyribonucleotide sequence isreplaced by the ribonucleotide uridine (U). For instance, reference toan RNA molecule having the sequence of SEQ ID NO: 1, 3 or 5, as setforth using deoxyribonucleotide abbreviations, is intended to indicatean RNA molecule having a sequence in which each deoxyribonucleotide A, Gor C of SEQ ID NO:1 has been replaced by the correspondingribonucleotide A, G or C, and each deoxyribonucleotide T has beenreplaced by a ribonucleotide U.

[0129] Using the information provided herein, such as the nucleotidesequence in FIGS. 1, 2, or 3, a nucleic acid molecule of the presentinvention encoding an MPIF-1, M-CIF or MIP-4 (respectively) polypeptidemay be obtained using standard cloning and screening procedures, such asthose for cloning cDNAs using mRNA as starting material.

[0130] The present invention further relates to variants of thehereinabove described polynucleotides which encode for fragments,analogs and derivatives of the polypeptide having the deduced amino acidsequence of FIGS. 1, 2 and 3 (SEQ ID NOS:2, 4 and 6) or the polypeptidesencoded by the cDNA of the deposited clone(s). The variants of thepolynucleotides can be a naturally occurring allelic variant of thepolynucleotides or a non-naturally occurring variant of thepolynucleotides.

[0131] The present invention also includes polynucleotides encoding thesame mature polypeptides as shown in FIGS. 1, 2 and 3 (SEQ ID NOS:2, 4and 6) or the same mature polypeptides encoded by the cDNA of thedeposited clone(s) as well as variants of such polynucleotides whichvariants encode for a fragment, derivative or analog of the polypeptidesof FIGS. 1, 2 and 3 (SEQ ID NOS:2, 4 and 6) or the polypeptides encodedby the cDNA of the deposited clone(s). Such nucleotide variants includedeletion variants, substitution variants and addition or insertionvariants.

[0132] As hereinabove indicated, the polynucleotide can have a codingsequence which is a naturally occurring allelic variant of the codingsequence shown in FIGS. 1, 2 and 3 (SEQ ID NOS:2, 4 and 6) or of thecoding sequence of the deposited clone(s). As known in the art, anallelic variant is an alternate form of a polynucleotide sequence whichcan have a substitution, deletion or addition of one or morenucleotides, which does not substantially alter the function of theencoded polypeptide.

[0133] The present invention also includes polynucleotides, wherein thecoding sequence for the mature polypeptides can be fused in the samereading frame to a polynucleotide sequence which aids in expression andsecretion of a polypeptide from a host cell, for example, a leadersequence which functions as a secretory sequence for controllingtransport of a polypeptide from the cell. The polypeptide having aleader sequence is a preprotein and can have the leader sequence cleavedby the host cell to form the mature form of the polypeptide. Thepolynucleotides can also encode for a proprotein which is the matureprotein plus additional 5′ amino acid residues. A mature protein havinga prosequence is a proprotein and is an inactive form of the protein.Once the prosequence is cleaved an active mature protein remains.

[0134] Thus, for example, the polynucleotides of the present inventioncan encode for a mature protein, or for a protein having a prosequenceor for a protein having both a prosequence and a presequence (leadersequence).

[0135] The polynucleotides of the present invention can also have thecoding sequence fused in frame to a marker sequence which allows forpurification of the polypeptides of the present invention. The markersequence can be a hexa-histidine tag supplied by a pQE-9 vector toprovide for purification of the mature polypeptides fused to the markerin the case of a bacterial host, or, for example, the marker sequencecan be a hemagglutinin (HA) tag when a mammalian host, e.g. COS-7 cells,is used. The HA tag corresponds to an epitope derived from the influenzahemagglutinin protein (Wilson, I., et al., Cell, 3 7:767 (1984)).

[0136] The term “gene” means the segment of DNA involved in producing apolypeptide chain; it includes regions preceding and following thecoding region (leader and trailer) as well as intervening sequences(introns) between individual coding segments (exons).

[0137] As indicated, nucleic acid molecules of the present invention maybe in the form of RNA, such as mRNA, or in the form of DNA, including,for instance, cDNA and genomic DNA obtained by cloning or producedsynthetically. The DNA may be double-stranded or single-stranded.Single-stranded DNA or RNA may be the coding strand, also known as thesense strand, or it may be the non-coding strand, also referred to asthe anti-sense strand.

[0138] The term “isolated” means that the material is removed from itsoriginal environment (e.g., the natural environment if it is naturallyoccurring). For example, a naturally-occurring polynucleotides orpolypeptides present in a living animal is not isolated, but the samepolynucleotides or DNA or polypeptides, separated from some or all ofthe coexisting materials in the natural system, is isolated. Suchpolynucleotides could be part of a vector and/or such polynucleotides orpolypeptides could be part of a composition, and still be isolated inthat such vector or composition is not part of its natural environment.Isolated RNA molecules include in vivo or in vitro RNA transcripts ofthe DNA molecules of the present invention. Isolated nucleic acidmolecules according to the present invention further include suchmolecules produced synthetically.

[0139] Isolated nucleic acid molecules of the present invention includeDNA molecules comprising an open reading frame (ORF) for a MPIF-1, M-CIFor MIP-4 cDNA; DNA molecules comprising the coding sequence for a matureM-CIF, MPIF-1 or MIP-4 protein; and DNA molecules which comprise asequence substantially different from those described above but which,due to the degeneracy of the genetic code, still encode an MPIF-1, M-CIFor MIP-4 polypeptide. Of course, the genetic code is well known in theart. Thus, it would be routine for one skilled in the art to generatethe degenerate variants described above.

[0140] The present invention further relates to polynucleotides whichhybridize to the hereinabove-described sequences if there is at least70%, preferably at least 90%, and more preferably at least 95% identitybetween the sequences. The present invention particularly relates topolynucleotides which hybridize under stringent conditions to thehereinabove-described polynucleotides. As herein used, the term“stringent conditions” means hybridization will occur only if there isat least 95% and preferably at least 97% identity between the sequences.The polynucleotides which hybridize to the hereinabove describedpolynucleotides in a preferred embodiment encode polypeptides whichretain substantially the same biological function or activity as themature polypeptide encoded by the cDNAs of FIGS. 1, 2 and 3 (SEQ IDNO:1, 3 and 5) or the deposited cDNA(s).

[0141] Alternatively, the polynucleotide may have at least 20 bases,preferably 30 bases, and more preferably at least 50 bases whichhybridize to a polynucleotide of the present invention and which has anidentity thereto, as hereinabove described, and which may or may notretain activity. For example, such polynucleotides may be employed asprobes for the polynucleotide of SEQ ID NO:1, 3 and 5, for example, forrecovery of the polynucleotide or as a diagnostic probe or as a PCRprimer.

[0142] In another aspect, the invention provides an isolated nucleicacid molecule comprising a polynucleotide which hybridizes understringent hybridization conditions to a portion of the polynucleotide ina nucleic acid molecule of the invention described above, for instance,the cDNA clone contained in ATCC Deposit 75572 (M-CIF); ATCC Deposit75676 (MPIF-1); or ATCC Deposit 75675 (MIP-4). By “stringenthybridization conditions” is intended overnight incubation at 42° C. ina solution comprising: 50% formamide, 5×SSC (150 mM NaCl, 15 mMtrisodium citrate), 50 mM sodium phosphate (pH 7.6), 5×Denhardt'ssolution, 10% dextran sulfate, and 20 g/ml denatured, sheared salmonsperm DNA, followed by washing the filters in 0.1×SSC at about 65° C.

[0143] By a polynucleotide which hybridizes to a “portion” of apolynucleotide is intended a polynucleotide (either DNA or RNA)hybridizing to at least about 15 nucleotides (nt), and more preferablyat least about 20 nt, still more preferably at least about 30 nt, andeven more preferably about 30-70 nt of the reference polynucleotide.These are useful as diagnostic probes and primers as discussed above andin more detail below.

[0144] Of course, polynucleotides hybridizing to a larger portion of thereference polynucleotide (e.g. the deposited cDNA clone), for instance,a portion 50-750 nt in length, or even to the entire length of thereference polynucleotide, are also useful as probes according to thepresent invention, as are polynucleotides corresponding to most, if notall, of the nucleotide sequence of the deposited cDNA or the nucleotidesequence as shown in FIG. 2 (M-CIF); FIG. 1 (MPIF-1); or FIG. 3 (MIP-4).By a portion of a polynucleotide of “at least 20 nt in length,” forexample, is intended 20 or more contiguous nucleotides from thenucleotide sequence of the reference polynucleotide. As indicated, suchportions are useful diagnostically either as a probe according toconventional DNA hybridization techniques or as primers foramplification of a target sequence by the polymerase chain reaction(PCR), as described, for instance, in Molecular Cloning, A LaboratoryManual, 2nd. edition, Sambrook, J., Fritsch, E. F. and Maniatis, T.,eds., Cold Spring Harbor Laboratory Press, Cold Spring Harbor, N.Y.(1989), the entire disclosure of which is hereby incorporated herein byreference.

[0145] Since a MPIF-1, M-CIF and MIP-4 CDNA clones have been depositedand its determined nucleotide sequence provided, generatingpolynucleotides which hybridize to a portion of the MPIF-1, M-CIF orMIP-4 CDNA molecules would be routine to the skilled artisan. Forexample, restriction endonuclease cleavage or shearing by sonication ofa MPIF-1, M-CIF or MIP-4 cDNA clone could easily be used to generate DNAportions of various sizes which are polynucleotides that hybridize,respectively, to a portion of the MPIF-1, M-CIF or MIP-4 cDNA molecules.

[0146] Alternatively, the hybridizing polynucleotides of the presentinvention could be generated synthetically according to knowntechniques. Of course, a polynucleotide which hybridizes only to a polyA sequence (such as the 3′ terminal poly(A) tract of a cDNA, or to acomplementary stretch of T (or U) residues, would not be included in apolynucleotide of the invention used to hybridize to a portion of anucleic acid of the invention, since such a polynucleotide wouldhybridize to any nucleic acid molecule containing a poly (A) stretch orthe complement thereof (e.g. practically any double-stranded cDNAclone).

[0147] As indicated, nucleic acid molecules of the present inventionwhich encode an MPIF-1, M-CIF or MIP-4 polypeptide may include, but arenot limited to those encoding the amino acid sequence of the maturepolypeptide, by itself, the coding sequence for the mature polypeptideand additional sequences, such as those encoding the leader or secretorysequence, such as a pre-, or pro- or prepro- protein sequence; thecoding sequence of the mature polypeptide, with or without theaforementioned additional coding sequences, together with additional,non-coding sequences, including for example, but not limited to intronsand non-coding 5′ and 3′ sequences, such as the transcribed,non-translated sequences that play a role in transcription, mRNAprocessing, including splicing and polyadenylation signals, forexample—ribosome binding and stability of mRNA; an additional codingsequence which codes for additional amino acids, such as those whichprovide additional functionalities. Thus, the sequence encoding thepolypeptide may be fused to a marker sequence, such as a sequenceencoding a peptide which facilitates purification of the fusedpolypeptide. In certain preferred embodiments of this aspect of theinvention, the marker amino acid sequence is a hexa-histidine peptide,such as the tag provided in a pQE vector (Qiagen, Inc.), among others,many of which are commercially available. As described in Gentz et al.,Proc. Natl. Acad. Sci. USA 86:821-824 (1989), for instance,hexa-histidine provides for convenient purification of the fusionprotein. The “HA” tag is another peptide useful for purification whichcorresponds to an epitope derived from the influenza hemagglutininprotein, which has been described by Wilson et al., Cell 37:767 (1984).As discussed below, other such fusion proteins include at least one ofan MPIF-1, M-CIF or MIP-4 polypeptide or fragment fused to Fc at the N-or C-terminus.

[0148] The present invention further relates to variants of the nucleicacid molecules of the present invention, which encode portions, analogsor derivatives of an MPIF-1, M-CIF or MIP-4 polypeptide. Variants mayoccur naturally, such as a natural allelic variant. By an “allelicvariant” is intended one of several alternate forms of a gene occupyinga given locus on a chromosome of an organism. Genes V, Lewin, B., ed.,Oxford University Press, New York (1994). Non-naturally occurringvariants may be produced using art-known mutagenesis techniques.

[0149] Such variants include those produced by nucleotide substitutions,deletions or additions. The substitutions, deletions or additions mayinvolve one or more nucleotides. The variants may be altered in codingregoins, non-coding regions, or both. Alterations in the coding regionsmay produce conservative or non-conservative amino acid substitutions,deletions or additions. Especially preferred among these are silentsubstitutions, additions and deletions, which do not alter theproperties and activities of an MPIF-1, M-CIF or MIP-4 polypeptide orportions thereof. Also especially preferred in this regard areconservative substitutions. Most highly preferred are nucleic acidmolecules encoding the mature protein or the mature amino acid sequenceencoded by the deposited cDNA clone, as described herein.

[0150] MPIF-1, M-CIF and MIP4 Homolog Polynucleotides

[0151] The present invention is further directed to polynucleotideshaving at least a 70% identity, preferably at least 90% and morepreferably at least a 95% identity to a polynucleotide which encodes thepolypeptide of SEQ ID NO:2, 4 and 6 as well as fragments thereof, whichfragments have at least 30 bases and preferably at least 50 bases and topolypeptides encoded by such polynucleotides.

[0152] Further embodiments of the invention include isolated nucleicacid molecules comprising a polynucleotide having a nucleotide sequenceat least 90% identical, and more preferably at least 95%, 96%, 97%, 98%or 99% identical to (a) a nucleotide sequence encoding an MPIF-1, M-CIFor MIP-4 polypeptide or fragment, having an amino acid sequence of FIG.1, FIG. 2, or FIG. 3 resepectively, including the predicted leadersequence; (b) a nucleotide sequence encoding the mature MPIF-1, M-CIF orMIP-4 polypeptide (full-length polypeptide with the leader removed); (c)a nucleotide sequence encoding the full-length polypeptide having thecomplete amino acid sequence including the leader encoded by thedeposited cDNA clone; (d) a nucleotide sequence encoding the maturepolypeptide having the amino acid sequence encoded by the deposited cDNAclone; or (e) a nucleotide sequence complementary to any of thenucleotide sequences in (a), (b), (c) or (d).

[0153] By a polynucleotide having a nucleotide sequence at least, forexample, 95% “identical” to a reference nucleotide sequence encoding anMPIF-1, M-CIF or MIP-4 polypeptide is intended that the nucleotidesequence of the polynucleotide is identical to the reference sequenceexcept that the polynucleotide sequence may include up to five pointmutations per each 100 nucleotides of the reference nucleotide sequenceencoding the polypeptide. In other words, to obtain a polynucleotidehaving a nucleotide sequence at least 95% identical to a referencenucleotide sequence, up to 5% of the nucleotides in the referencesequence may be deleted or substituted with another nucleotide, or anumber of nucleotides up to 5% of the total nucleotides in the referencesequence may be inserted into the reference sequence. These mutations ofthe reference sequence may occur at the 5′ or 3′ terminal positions ofthe reference nucleotide sequence or anywhere between those terminalpositions, interspersed either individually among nucleotides in thereference sequence or in one or more contiguous groups within thereference sequence.

[0154] As a practical matter, whether any particular nucleic acidmolecule is at least 90%, 95%, 96%, 97%, 98% or 99% identical to, forinstance, the nucleotide sequence shown in FIGS. 1, 3 or 5, or to thenucleotides sequence of the deposited cDNA clone can be determinedconventionally using known computer programs such as the Bestfit program(Wisconsin Sequence Analysis Package, Version 8 for Unix, GeneticsComputer Group, University Research Park, 575 Science Drive, Madison,Wis. 53711. Bestfit uses the local homology algorithm of Smith andWaterman, Advances in Applied Mathematics 2: 482-489 (1981), to find thebest segment of homology between two sequences. When using Bestfit orany other sequence alignment program to determine whether a particularsequence is, for instance, 95% identical to a reference sequenceaccording to the present invention, the parameters are set, of course,such that the percentage of identity is calculated over the full lengthof the reference nucleotide sequence and that gaps in homology of up to5% of the total number of nucleotides in the reference sequence areallowed.

[0155] As one of ordinary skill would appreciate, due to thepossibilities of sequencing errors discussed above, as well as thevariability of cleavage sites for leaders in different known proteins,the actual M-CIF polypeptide encoded by the deposited cDNA comprisesabout 74 amino acids, but may be anywhere in the range of 69-93 aminoacids; and the actual leader sequence of this protein is about 19 aminoacids, but may be anywhere in the range of about 15 to about 24 aminoacids.

[0156] As one of ordinary skill would appreciate, due to thepossibilities of sequencing errors discussed above, as well as thevariability of cleavage sites for leaders in different known proteins,the actual MPIF-1 polypeptide encoded by the deposited cDNA comprisesabout 99 amino acids, but may be anywhere in the range of 75-120 aminoacids; and the actual leader sequence of this protein is about 21 aminoacids, but may be anywhere in the range of about 15 to about 35 aminoacids.

[0157] As one of ordinary skill would appreciate, due to thepossibilities of sequencing errors discussed above, as well as thevariability of cleavage sites for leaders in different known proteins,the actual MIP-4 polypeptide encoded by the deposited cDNA comprisesabout 69 amino acids, but may be anywhere in the range of 60-89 aminoacids; and the actual leader sequence of this protein is about 20 aminoacids, but may be anywhere in the range of about 15 to about 30 aminoacids.

[0158] NucleicAcid Probes

[0159] Such isolated molecules, particularly DNA molecules, are usefulas probes for gene mapping, by in situ hybridization with, chromosomes,and for detecting expression of a MPIF-1, M-CIF and/or MIP-4 gene inhuman tissue, for instance, by Northern blot analysis. The presentinvention is further directed to fragments of the isolated nucleic acidmolecules described herein. By a fragment of an isolated nucleic acidmolecule having the nucleotide sequence of the deposited MPIF-1, M-CIFor MIP-4 cDNAs, or a nucleotide sequence shown in any or all of FIGS. 1,2 and 3 (SEQ ID NOS: 1, 3, and 5), respectively, is intended fragmentsat least about 15 nt, and more preferably at least about 20 nt, stillmore preferably at least about 30 nt, and even more preferably, at leastabout 40 nt in length which are useful as diagnostic probes and primersas discussed herein. Of course, larger fragments 50-500 nt in length arealso useful according to the present invention as are fragmentscorresponding to most, if not all, of a nucleotide sequence of thedeposited MPIF-1, M-CIF or MIP-4 cDNAs, or as shown in FIGS. 1, 2 and 3(SEQ ID NOS:1, 3, and 5). By a fragment at least 20 nt in length, forexample, is intended fragments which include 20 or more contiguous basesfrom the nucleotide sequence of the deposited cDNA or the nucleotidesequence as shown in FIGS. 1, 2 and 3 (SEQ ID NOS:1, 3, and 5). Sincethe gene has been deposited and the nucleotide sequences shown in FIGS.1, 2 and 3 (SEQ ID NOS:1, 3, and 5) are provided, generating such DNAfragments would be routine to the skilled artisan. For example,restriction endonuclease cleavage or shearing by sonication could easilybe used to generate fragments of various sizes. Alternatively, suchfragments could be generated synthetically.

[0160] Fragments of the full length gene of the present invention may beused as a hybridization probe for a CDNA library to isolate the fulllength cDNA and to isolate other cDNAs which have a high sequencesimilarity to the gene or similar biological activity. Probes of thistype preferably have at least 30 bases and may contain, for example, 50or more bases. The probe may also be used to identify a cDNA clonecorresponding to a full length transcript and a genomic clone or clonesthat contain the complete gene including regulatory and promotorregions, exons, and introns. An example of a screen comprises isolatingthe coding region of the gene by using the known DNA sequence tosynthesize an oligonucleotide probe. Labeled oligonucleotides having asequence complementary to that of the gene of the present invention areused to screen a library of human cDNA, genomic DNA or mRNA to determinewhich members of the library the probe hybridizes to.

[0161] Vectors and Host Cells

[0162] The present invention also relates to vectors which include theisolated DNA molecules of the present invention, host cells which aregenetically engineered with the recombinant vectors, and the productionof MPIF-1, M-CIF or MIP-4 polypeptides or fragments thereof byrecombinant techniques.

[0163] Recombinant constructs may be introduced into host cells usingwell known techniques such infection, transduction, transfection,transvection, electroporation and transformation. The vector may be, forexample, a phage, plasmid, viral or retroviral vector. Retroviralvectors may be replication competent or replication defective. In thelatter case, viral propagation generally will occur only incomplementing host cells.

[0164] The polynucleotides may be joined to a vector containing aselectable marker for propagation in a host. Generally, a plasmid vectoris introduced in a precipitate, such as a calcium phosphate precipitate,or in a complex with a charged lipid. If the vector is a virus, it maybe packaged in vitro using an appropriate packaging cell line and thentransduced into host cells.

[0165] Preferred are vectors comprising cis-acting control regions tothe polynucleotide of interest. Appropriate trans-acting factors may besupplied by the host, supplied by a complementing vector or supplied bythe vector itself upon introduction into the host.

[0166] In certain preferred embodiments in this regard, the vectorsprovide for specific expression, which may be inducible and/or celltype-specific. Particularly preferred among such vectors are thoseinducible by environmental factors that are easy to manipulate, such astemperature and nutrient additives.

[0167] Expression vectors useful in the present invention includechromosomal-, episomal- and virus-derived vectors, e.g. vectors derivedfrom bacterial plasmids, bacteriophage, yeast episomes, yeastchromosomal elements, viruses such as baculoviruses, papova viruses,vaccinia viruses, adenoviruses, fowl pox viruses, pseudorabies virusesand retroviruses, and vectors derived from combinations thereof, such ascosmids and phagemids.

[0168] The DNA insert should be operatively linked to an appropriatepromoter, such as the phage lambda PL promoter, the E. coli lac, trp andtac promoters, the SV40 early and late promoters and promoters ofretroviral LTRs, to name a few. Other suitable promoters will be knownto the skilled artisan. The expression constructs will further containsites for transcription initiation, termination and, in the transcribedregion, a ribosome binding site for translation. The coding portion ofthe mature transcripts expressed by the constructs will preferablyinclude a translation initiating at the beginning and a terminationcodon (UAA, UGA or UAG) appropriately positioned at the end of thepolypeptide to be translated.

[0169] As indicated, the expression vectors will preferably include atleast one selectable marker. Such markers include dihydrofolatereductase or neomycin resistance for eukaryotic cell culture andtetracycline or ampicillin resistance genes for culturing in E. coli andother bacteria. Representative examples of appropriate hosts include,but are not limited to, bacterial cells, such as E. coli, Streptomycesand Salmonella typhimurium cells; fungal cells, such as yeast cells;insect cells such as Drosophila S2 and Spodoptera Sf9 cells; animalcells such as CHO, COS and Bowes melanoma cells; and plant cells.Appropriate culture mediums and conditions for the above-described hostcells are known in the art.

[0170] Among vectors preferred for use in bacteria include pQE70, pQE60and pQE-9, (Qiagen); pBS vectors, pD10, Phagescript vectors, pBluescriptvectors, pNH8A, pNH16a, pNH18A, pNH46A, available from Stratagene; andptrc99a, pKK223-3, pKK233-3, pDR540, pRIT5 available from Pharmacia.Among preferred eukaryotic vectors are pWLNEO, pSV2CAT, pOG44, pXT1 andpSG available from Stratagene; and pSVK3, pBPV, pMSG and pSVL availablefrom Pharmacia. Other suitable vectors will be readily apparent to theskilled artisan.

[0171] Among known bacterial promoters suitable for use in the presentinvention include the E. coli lacI and lacZ promoters, the T3 and T7promoters, the gpt promoter, the lambda PR and PL promoters and the trppromoter. Suitable eukaryotic promoters include the CMV immediate earlypromoter, the HSV thymidine kinase promoter, the early and late SV40promoters, the promoters of retroviral LTRs, such as those of the RousSarcoma Virus (RSV), and metallothionein promoters, such as the mousemetallothionein-I promoter.

[0172] Introduction of the construct into the host cell can be effectedby calcium phosphate transfection, DEAE-dextran mediated transfection,cationic lipid-mediated transfection, electroporation, transduction,infection or other methods. Such methods are described in many standardlaboratory manuals, such as Davis et al., Basic Methods In MolecularBiology (1986).

[0173] Transcription of the DNA encoding the polypeptides of the presentinvention by higher eukaryotes may be increased by inserting an enhancersequence into the vector. Enhancers are cis-acting elements of DNA,usually about from 10 to 300 bp that act to increase transcriptionalactivity of a promoter in a given host cell-type. Examples of enhancersinclude the SV40 enhancer, which is located on the late side of thereplication origin at bp 100 to 270, the cytomegalovirus early promoterenhancer, the polyoma enhancer on the late side of the replicationorigin, and adenovirus enhancers.

[0174] The present invention also relates to vectors which includepolynucleotides of the present invention, host cells which aregenetically engineered with vectors of the invention and the productionof polypeptides of the invention by recombinant techniques.

[0175] Host cells are genetically engineered (transduced or transformedor transfected) with the vectors of this invention which can be, forexample, a cloning vector or an expression vector. The vector can be,for example, in the form of a plasmid, a viral particle, a phage, etc.The engineered host cells can be cultured in conventional nutrient mediamodified as appropriate for activating promoters, selectingtransformants or amplifying the MPIF-1, MIP-4 and M-CIF genes. Theculture conditions, such as temperature, pH and the like, are thosepreviously used with the host cell selected for expression, and will beapparent to the ordinarily skilled artisan.

[0176] The polynucleotides of the present invention can be employed forproducing polypeptides by recombinant techniques. Thus, for example, thepolynucleotide sequence can be included in any one of a variety ofexpression vehicles, in particular vectors or plasmids for expressing apolypeptide. Such vectors include chromosomal, nonchromosomal andsynthetic DNA sequences, e.g. derivatives of SV40; bacterial plasmids;phage DNA; yeast plasmids; vectors derived from combinations of plasmidsand phage DNA, viral DNA such as vaccinia, adenovirus, fowl pox virus,and pseudorabies. However, any other plasmid or vector can be used aslong they are replicable and viable in the host.

[0177] The appropriate DNA sequence can be inserted into the vector by avariety of procedures. In general, the DNA sequence is inserted into anappropriate restriction endonuclease site(s) by procedures known in theart. Such procedures and others are deemed to be within the scope ofthose skilled in the art.

[0178] The DNA sequence in the expression vector is operatively linkedto an appropriate expression control sequence(s) (promoter) to directmRNA synthesis. As representative examples of such promoters, there canbe mentioned: LTR or SV40 promoter, the E. coli. lac or trp, the phagelambda P_(L) promoter and other promoters known to control expression ofgenes in prokaryotic or eukaryotic cells or their viruses. Theexpression vector also contains a ribosome binding site for translationinitiation and a transcription terminator. The vector can also includeappropriate sequences for amplifying expression.

[0179] In addition, the expression vectors preferably contain a gene toprovide a phenotypic trait for selection of transformed host cells suchas dihydrofolate reductase or neomycin resistance for eukaryotic cellculture, or such as tetracycline or ampicillin resistance in E. coli.

[0180] The vector containing the appropriate DNA sequence as hereinabovedescribed, as well as an appropriate promoter or control sequence, canbe employed to transform an appropriate host to permit the host toexpress the protein.

[0181] As representative examples of appropriate hosts, there can bementioned: bacterial cells, such as E. coli, Streptomyces, SalmonellaTyphimurium; fungal cells, such as yeast; insect cells such asDrosophila and Sf9; animal cells such as CHO, COS or Bowes melanoma;plant cells, etc. The selection of an appropriate host is deemed to bewithin the scope of those skilled in the art from the teachings herein.

[0182] More particularly, the present invention also includesrecombinant constructs comprising one or more of the sequences asbroadly described above. The constructs comprise a vector, such as aplasmid or viral vector, into which a sequence of the invention has beeninserted, in a forward or reverse orientation. In a preferred aspect ofthis embodiment, the construct further comprises regulatory sequences,including, for example, a promoter, operably linked to the sequence.Large numbers of suitable vectors and promoters are known to those ofskill in the art, and are commercially available. The following vectorsare provided by way of example. Bacterial: pQE70, pQE60, pQE-9 (Qiagen),pbs, pD10, phagescript, psiX174, pbluescript SK, pbsks, pNH8A, pNH16a,pNH18A, pNH46A (Stratagene); ptrc99a, pKK223-3, pKK233-3, pDR540, pRIT5(Pharmacia). Eukaryotic: pWLNEO, pSV2CAT, pOG44, pXT1, pSG (Stratagene)pSVK3, pBPV, pMSG, pSVL (Pharmacia). However, any other plasmid orvector can be used as long as they are replicable and viable in thehost.

[0183] Promoter regions can be selected from any desired gene using CAT(chloramphenicol transferase) vectors or other vectors with selectablemarkers. Two appropriate vectors are PKK232-8 and PCM7. Particular namedbacterial promoters include lacI, lacZ, T3, T7, gpt, lambda P_(R), P_(L)and trp. Eukaryotic promoters include CMV immediate early, HSV thymidinekinase, early and late SV40, LTRs from retrovirus, and mousemetallothionein-I. Selection of the appropriate vector and promoter iswell within the level of ordinary skill in the art.

[0184] In a further embodiment, the present invention relates to hostcells containing the above-described construct. The host cell can be ahigher eukaryotic cell, such as a mammalian cell, or a lower eukaryoticcell, such as a yeast cell, or the host cell can be a prokaryotic cell,such as a bacterial cell. Introduction of the construct into the hostcell can be effected by calcium phosphate transfection, DEAE-Dextranmediated transfection, or electroporation. (Davis, L., Dibner, M.,Battey, I., Basic Methods in Molecular Biology, (1986)).

[0185] The constructs in host cells can be used in a conventional mannerto produce the gene product encoded by the recombinant sequence.Alternatively, the polypeptides of the invention can be syntheticallyproduced by conventional peptide synthesizers.

[0186] Mature proteins can be expressed in mammalian cells, yeast,bacteria, or other cells under the control of appropriate promoters.Cell-free translation systems can also be employed to produce suchproteins using RNAs derived from the DNA constructs of the presentinvention. Appropriate cloning and expression vectors for use withprokaryotic and eukaryotic hosts are described by Sambrook, et al.,Molecular Cloning: A Laboratory Manual, Second Edition, Cold SpringHarbor, N.Y., (1989), the disclosure of which is hereby incorporated byreference.

[0187] Transcription of the DNA encoding the polypeptides of the presentinvention by higher eukaryotes is increased by inserting an enhancersequence into the vector. Enhancers are cis-acting elements of DNA,usually about from 10 to 300 bp that act on a promoter to increase itstranscription. Examples including the SV40 enhancer on the late side ofthe replication origin bp 100 to 270, a cytomegalovirus early promoterenhancer, the polyoma enhancer on the late side of the replicationorigin, and adenovirus enhancers.

[0188] Generally, recombinant expression vectors will include origins ofreplication and selectable markers permitting transformation of the hostcell, e.g. the ampicillin resistance gene of E. coli and S. cerevisiaeTRP1 gene, and a promoter derived from a highly-expressed gene to directtranscription of a downstream structural sequence. Such promoters can bederived from operons encoding glycolytic enzymes such as3-phosphoglycerate kinase (PGK), α-factor, acid phosphatase, or heatshock proteins, among others. The heterologous structural sequence isassembled in appropriate phase with translation initiation andtermination sequences, and preferably, a leader sequence capable ofdirecting secretion of translated protein into the periplasmic space orextracellular medium. Optionally, the heterologous sequence can encode afusion protein including an N-terminal identification peptide impartingdesired characteristics, e.g. stabilization or simplified purificationof expressed recombinant product.

[0189] Useful expression vectors for bacterial use are constructed byinserting a structural DNA sequence encoding a desired protein togetherwith suitable translation initiation and termination signals in operablereading phase with a functional promoter. The vector will comprise oneor more phenotypic selectable markers and an origin of replication toensure maintenance of the vector and to, if desirable, provideamplification within the host. Suitable prokaryotic hosts fortransformation include E. coli, Bacillus subtilis, Salmonellatyphimurium and various species within the genera Pseudomonas,Streptomyces, and Staphylococcus, although others can also be employedas a matter of choice.

[0190] As a representative but nonlimiting example, useful expressionvectors for bacterial use can comprise a selectable marker and bacterialorigin of replication derived from commercially available plasmidscomprising genetic elements of the well known cloning vector pBR322(ATCC 37017). Such commercial vectors include, for example, pKK223-3(Pharmacia Fine Chemicals, Uppsala, Sweden) and GEM1 (Promega Biotec,Madison, Wis., USA). These pBR322 “backbone” sections are combined withan appropriate promoter and the structural sequence to be expressed.Following transformation of a suitable host strain and growth of thehost strain to an appropriate cell density, the selected promoter isinduced by appropriate means (e.g. temperature shift or chemicalinduction) and cells are cultured for an additional period.

[0191] Cells are typically harvested by centrifugation, disrupted byphysical or chemical means, and the resulting crude extract retained forfurther purification.

[0192] Microbial cells employed in expression of proteins can bedisrupted by any convenient method, including freeze-thaw cycling,sonication, mechanical disruption, or use of cell lysing agents, suchmethods are well known to those skilled in the art.

[0193] Various mammalian cell culture systems can also be employed toexpress recombinant protein. Examples of mammalian expression systemsinclude the COS-7 lines of monkey kidney fibroblasts, described byGluzman, Cell, 23:175 (1981), and other cell lines capable of expressinga compatible vector, for example, the C127, 3T3, CHO, HeLa and BHK celllines. Mammalian expression vectors will comprise an origin ofreplication, a suitable promoter and enhancer, and also any necessaryribosome binding sites, polyadenylation site, splice donor and acceptorsites, transcriptional termination sequences, and 5′ flankingnontranscribed sequences. DNA sequences derived from the SV40 splice,and polyadenylation sites can be used to provide the requirednontranscribed genetic elements.

[0194] Polypeptides and Polypeptide Fragments

[0195] The invention further provides an isolated MPIF-1, M-CIF, orMIP-4 polypeptide having the amino acid sequence encoded by thedeposited cDNA, or the amino acid sequence in FIGS. 1, 2 or 3 (SEQ IDNO:2, 4, or 6, respectively), or a peptide or polypeptide comprising aportion of the above polypeptides. The terms “peptide” and“oligopeptide” are considered synonymous (as is commonly recognized) andeach term can be used interchangeably as the context requires toindicate a chain of at least two amino acids coupled by peptidyllinkages. The word “polypeptide” is used herein for chains containingmore than ten amino acid residues. All oligopeptide and polypeptideformulas or sequences herein are written from left to right and in thedirection from amino terminus to carboxy terminus.

[0196] By “a polypeptide having MPIF-1 activity” is intendedpolypeptides exhibiting activity similar, but not necessarily identical,to an activity of the MPIF-1 protein of the invention (either thefull-length protein or, preferably, the mature protein), as measured ina particular biological assay. MPIF-1 protein activity can be measuredby the assays set forth in Examples 15, 16, as well as FIG. 11. Forexample, MPIF-1 protein activity measured using the in vitromyeloprotection assay disclosed in Example 15, infra.

[0197] Briefly, lineage-depleted populations of cells (Lin⁻ cells ) areisolated from mouse bone marrow and incubated in the presence ofmultiple cytokines with or without MPIF-1. After 48 hours, one set ofeach culture receives 5-Fu and the incubation is then continued foradditional 24 hours, at which point the numbers of surviving lowproliferative potential colony-forming cells (LPP-CFC) are determined byany suitable clonogenic assay known to those of skill in the art. Alarge percentatge (e.g.,≧30-50%, such as ≧40%) of LPP-CFC are protectedfrom the 5-Fu-induced cytotoxicty in the presence of MPIF-1, whereaslittle protection (<5% ) of LPP-CFC will be observed in the absence ofMPIF-1 or in the presence of an unrelated protein. In such an assay,high proliferative potential colony-forming cells (HPP-CFC) canadditionally be protected from the 5-Fu-induced cytotoxicty in thepresence of MPIF-1, but in some cases are not. HPP-CFC are generally notprotected when LPP-CFC are not protected.

[0198] Thus, “a polypeptide having MPIF-1 protein activity” includespolypeptides that exhibit MPIF-1 activity, in the above-described assay.Although the degree of activity need not be identical to that of theMPIF-1 protein, preferably, “a polypeptide having MPIF-1 proteinactivity” will exhibit substantially similar activity as compared to theMPIF-1 protein (i.e., the candidate polypeptide will exhibit greateractivity or not more than about twenty-fold less and, preferably, notmore than about ten-fold less activity relative to the reference MPIF-1protein).

[0199] By “a polypeptide having M-CIF activity” is intended polypeptidesexhibiting activity similar, but not necessarily identical, to anactivity of the M-CIF protein of the invention (either the full-lengthprotein or, preferably, the mature protein), as measured in a particularbiological assay. For example, M-CIF protein activity can be measuredusing the in vitro inhibition of M-CSF-induced colony formation byanimal cells, such as bone marrow cells, in an assay as described inExample 25, infra.

[0200] Thus, “a polypeptide having M-CIF protein activity” includespolypeptides that exhibit M-CIF activity, in the above-described assay.Although the degree of activity need not be identical to that of theM-CIF protein, preferably, “a polypeptide having M-CIF protein activity”will exhibit substantially similar activity as compared to the M-CIFprotein (i.e., the candidate polypeptide will exhibit greater activityor not more than about twenty-fold less and, preferably, not more thanabout ten-fold less activity relative to the reference M-CIF protein).

[0201] The present invention further relates to MPIF-1, M-CIF and MIP-4polypeptides which have the deduced amino acid sequence of FIGS. 1, 2and 3 (SEQ ID NOS: 2, 4, and 6) or which have the amino acid sequenceencoded by the deposited cDNA, as well as fragments, analogs andderivatives of such polypeptide.

[0202] The terms “fragment,” “derivative” and “analog” when referring tothe polypeptides of FIGS. 1, 2 and 3 (SEQ ID NOS: 2, 4, and 6) or thatencoded by the deposited cDNA, means a polypeptide which retainsessentially the same biological function or activity as suchpolypeptide. Thus, an analog includes a proprotein which can beactivated by cleavage of the proprotein portion to produce an activemature polypeptide.

[0203] The polypeptides of the present invention can be a recombinantpolypeptide, a natural polypeptide or a synthetic polypeptide,preferably a recombinant polypeptide.

[0204] The fragment, derivative or analog of the polypeptides of FIGS.1, 2 and 3 (SEQ ID NOS: 2, 4, and 6) or that encoded by the depositedcDNA can be (i) one in which one or more of the amino acid residues aresubstituted with a conserved or non-conserved amino acid residue(preferably a conserved amino acid residue) and such substituted aminoacid residues is or is not be one encoded by the genetic code, or (ii)one in which one or more of the amino acid residues includes asubstituent group, or (iii) one in which the mature polypeptides arefused with another compound, such as a compound to increase thehalf-life of the polypeptide (for example, polyethylene glycol), or (iv)one in which the additional amino acids are fused to the maturepolypeptides, such as a leader or secretory sequence or a sequence whichis employed for purification of the mature polypeptides or a proproteinsequence. Such fragments, derivatives and analogs are deemed to bewithin the scope of those skilled in the art from the teachings herein.

[0205] The polypeptides of the present invention are preferably providedin an isolated form, and preferably are purified to homogeneity.

[0206] The polypeptides of the present invention include the polypeptideof SEQ ID NO:2, 4 and 6 (in particular the mature polypeptide) as wellas polypeptides which have at least 70% similarity (preferably at least70% identity) to the polypeptide of SEQ ID NO:2, 4 and 6 and morepreferably at least 90% similarity (more preferably at least 90%identity) to the polypeptide of SEQ ID NO: 2, 4 and 6 and still morepreferably at least 95% similarity (still more preferably at least 95%identity) to the polypeptide of SEQ ID NO:2, 4 and 6 and also includeportions of such polypeptides with such portion of the polypeptidegenerally containing at least 30 amino acids and more preferably atleast 50 amino acids.

[0207] As known in the art “similarity” between two polypeptides isdetermined by comparing the amino acid sequence and its conserved aminoacid substitutes of one polypeptide to the sequence of a secondpolypeptide.

[0208] Of course, due to the degeneracy of the genetic code, one ofordinary skill in the art will immediately recognize that a large numberof the nucleic acid molecules having a sequence at least 90%, 95%, 96%,97%, 98%, or 99% identical to the nucleic acid sequence of the depositedcDNA (ATCC 75676) or the nucleic acid sequence shown in FIG. 1 (SEQ IDNO: 1) will encode a polypeptide “having MPIF-1 protein activity.” Oneof ordinary skill in the art will also immediately recognize that alarge number of the nucleic acid molecules having a sequence at least90%, 95%, 96%, 97%, 98%, or 99% identical to the nucleic acid sequenceof the deposited CDNA (ATCC 75572) or the nucleic acid sequence shown inFIG. 2 (SEQ ID NO:3) will encode a polypeptide “having M-CIF proteinactivity.” Additionally, one of ordinary skill in the art willimmediately recognize that a large number of the nucleic acid moleculeshaving a sequence at least 90%, 95%, 96%, 97%, 98%, or 99% identical tothe nucleic acid sequence of the deposited CDNA (ATCC 75675) or thenucleic acid sequence shown in FIG. 3 (SEQ ID NO:5) will encode apolypeptide “having MIP-4 protein activity.” In fact, since degeneratevariants of these nucleotide sequences all encode the same polypeptide,this will be clear to the skilled artisan even without performing theabove described comparison assay. It will be further recognized in theart that, for such nucleic acid molecules that are not degeneratevariants, a reasonable number will also encode a polypeptide havingMPIF-1, M-CIF or MIP-4 protein activity. This is because the skilledartisan is fully aware of amino acid substitutions that are either lesslikely or not likely to significantly effect protein function (e.g.replacing one aliphatic amino acid with a second aliphatic amino acid).

[0209] For example, guidance concerning how to make phenotypicallysilent amino acid substitutions is provided in Bowie, J. U. et al.,“Deciphering the Message in Protein Sequences: Tolerance to Amino AcidSubstitutions,” Science 247:1306-1310 (1990), wherein the authorsindicate that there are two main approaches for studying the toleranceof an amino acid sequence to change. The first method relies on theprocess of evolution, in which mutations are either accepted or rejectedby natural selection. The second approach uses genetic engineering tointroduce amino acid changes at specific positions of a cloned gene andselections or screens to identify sequences that maintain functionality.As the authors state, these studies have revealed that proteins aresurprisingly tolerant of amino acid substitutions. The authors furtherindicate which amino acid changes are likely to be permissive at acertain position of the protein. For example, most buried amino acidresidues require nonpolar side chains, whereas few features of surfaceside chains are generally conserved. Other such phenotypically silentsubstitutions are described in Bowie, J. U. et al., supra, and thereferences cited therein.

[0210] Fragments or portions of the polypeptides of the presentinvention may be employed for producing the corresponding full-lengthpolypeptide by peptide synthesis; therefore, the fragments may beemployed as intermediates for producing the full-length polypeptides.Fragments or portions of the polynucleotides of the present inventionmay be used to synthesize full-length polynucleotides of the presentinvention.

[0211] For secretion of the translated protein into the lumen of theendoplasmic reticulum, into the periplasmic space or into theextracellular environment, appropriate secretion signals may beincorporated into the expressed polypeptide. The signals may beendogenous to the polypeptide or they may be heterologous signals.

[0212] The polypeptide may be expressed in a modified form, such as afusion protein, and may include not only secretion signals, but alsoadditional heterologous functional regions. For instance, a region ofadditional amino acids, particularly charged amino acids, may be addedto the N-terminus of the polypeptide to improve stability andpersistence in the host cell, during purification, or during subsequenthandling and storage. Also, peptide moieties may be added to thepolypeptide to facilitate purification. Such regions may be removedprior to final preparation of the polypeptide. The addition of peptidemoieties to polypeptides to engender secretion or excretion, to improvestability and to facilitate purification, among others, are familiar androutine techniques in the art. A preferred fusion protein comprises aheterologous region from immunoglobulin that is useful to solubilizeproteins. For example, EP-A-O 464 533 (Canadian counterpart 2045869)discloses fusion proteins comprising various portions of constant regionof immunoglobin molecules together with another human protein or partthereof. In many cases, the Fc part in a fusion protein is thoroughlyadvantageous for use in therapy and diagnosis and thus results, forexample, in improved pharmacokinetic properties (EP-A 0232 262). On theother hand, for some uses it would be desirable to be able to delete theFc part after the fusion protein has been expressed, detected andpurified in the advantageous manner described. This is the case when Fcportion proves to be a hindrance to use in therapy and diagnosis, forexample when the fusion protein is to be used as antigen forimmunizations. In drug discovery, for example, human proteins, such as,hIL5—has been fused with Fc portions for the purpose of high-throughputscreening assays to identify antagonists of hIL-5. See, D. Bennett etal., Journal of Molecular Recognition, Vol. 8:52-58 (1995) and K.Johanson et al., The Journal of Biological Chemistry, Vol. 270, No.16:9459-9471 (1995).

[0213] The MPIF-1, M-CIF or MIP-4 protein can be recovered and purifiedfrom recombinant cell cultures by well-known methods including ammoniumsulfate or ethanol precipitation, acid extraction, anion or cationexchange chromatography, phosphocellulose chromatography, hydrophobicinteraction chromatography, affinity chromatography, hydroxylapatitechromatography and lectin chromatography. Most preferably, highperformance liquid chromatography (“HPLC”) is employed for purification.Polypeptides of the present invention include naturally purifiedproducts, products of chemical synthetic procedures, and productsproduced by recombinant techniques from a prokaryotic or eukaryotichost, including, for example, bacterial, yeast, higher plant, insect andmammalian cells. Depending upon the host employed in a recombinantproduction procedure, the polypeptides of the present invention may beglycosylated or may be non-glycosylated. In addition, polypeptides ofthe invention may also include an initial modified methionine residue,in some cases as a result of host-mediated processes.

[0214] MPIF-1, M-CIF and MIP-4Polypeptide Variants

[0215] It will be recognized in the art that some amino acid sequencesof the MPIF-1, M-CIF or MIP-4 polypeptide can be varied withoutsignificant effect of the structure or function of the protein. If suchdifferences in sequence are contemplated, it should be remembered thatthere will be critical areas on the protein which determine activity. Ingeneral, it is possible to replace residues which form the tertiarystructure, provided that residues performing a similar function areused. In other instances, the type of residue may be completelyunimportant if the alteration occurs at a non-critical region of theprotein.

[0216] Thus, the invention further includes variations of an MPIF-1,M-CIF or MIP-4 polypeptide which show, respectively, substantial MPIF-1,M-CIF or MIP-4 polypeptide activity or which include regions,respectively, of an MPIF-1, M-CIF or MIP-4 protein such as the proteinportions discussed below. Such mutants include deletions, insertions,inversions, repeats, and type substitutions (for example, substitutingone hydrophilic residue for another, but not strongly hydrophilic forstrongly hydrophobic as a rule). Small changes or such “neutral” aminoacid substitutions will generally have little effect on activity.

[0217] Typically seen as conservative substitutions are thereplacements, one for another, among the aliphatic amino acids Ala, Val,Leu and Ile; interchange of the hydroxyl residues Ser and Thr, exchangeof the acidic residues Asp and Glu, substitution between the amideresidues Asn and Gln, exchange of the basic residues Lys and Arg andreplacements among the aromatic residues Phe, Tyr.

[0218] Of additional special interest are also substitutions of chargedamino acids with another charged amino acid or with neutral amino acids.This may result in proteins with improved characteristics such as lessaggregation. Prevention of aggregation is highly desirable. Aggregationof proteins cannot only result in a reduced activity but be problematicwhen preparing pharmaceutical formulations because they can beimmunogenic (Pinckard et al., Clin. Exp. Immunol. 2:331-340 (1967),Robbins et al., Diabetes 36: 838-845 (1987), Cleland et al., Crit. Rev.Therapeutic Drug Carrier Systems 10:307-377 (1993).

[0219] The replacement of amino acids can also change the selectivity ofthe binding to cell surface receptors. Ostade et al., Nature 361:266-268 (1993), described certain TNF alpha mutations resulting inselective binding of TNF alpha to only one of the two known TNFreceptors.

[0220] As indicated in detail above, further guidance concerning whichamino acid changes are likely to be phenotypically silent (i.e., are notlikely to have a significant deleterious effect on a function) can befound in Bowie, J. U., et al., “Deciphering the Message in ProteinSequences: Tolerance to Amino Acid Substitutions,” Science 247:1306-1310(1990) (see Table 1).

[0221] As indicated, changes are preferably of a minor nature, such asconservative amino acid substitutions that do not significantly affectthe folding or activity of the protein (see Table 1). TABLE 1Conservative Amino Acid Substitutions. Aromatic Phenylalanine TryptophanTyrosine Hydrophobic Leucine Isoleucine Valine Polar GlutamineAsparagine Basic Arginine Lysine Histidine Acidic Aspartic Acid GlutamicAcid Small Alanine Serine Threonine Methionine Glycine

[0222] MPIF-1 Variants

[0223] In addition, variants of MPIF-1 have been identified andcharacterized. Several of these analogs comprise amino terminaltruncations. In addition, an MPIF-1 analog apparently resulting from analternative splice site has also been identified and characterized.Example 17 discloses the biological activities of these MPIF-1 analogs.The sequences of these analogs are shown in FIG. 25.

[0224] In order to improve or alter the characteristics of the MPIF-1polypeptide(s), protein engineering may be employed. Recombinant DNAtechnology known to those skilled in the art can be used to create novelproteins. Muteins and deletions or fusion proteins can show, e.g.,enhanced activity or increased stability. In addition, they could bepurified in higher yields and show better solubility at least undercertain purification and storage conditions. Set below are additionalexamples of mutations that can be constructed.

[0225] MPIF-1 Aminoterminal and carboxyterminal deletions

[0226] Interferon gamma shows up to ten times higher activities bydeleting 8-10 amino acid residues from the carboxy terminus of theprotein (Döbeli et al., J. of Biotechnology 7:199-216 (1988). Ron etal., J. Biol. Chem., 268(4):2984-2988 (1993) reported modified KGFproteins that had heparin binding activity even if 3, 8, or 27 aminoterminal amino acid residues were missing. Many other examples are knownto anyone skilled in the art. Particularly preferred MPIF-1 polypeptidesare shown below: Val(23)---Asn(120) Val(23)---Lys(119)Thr(24)---Asn(120) Thr(24)---Arg(118) Lys(25)---Asn(120)Lys(25)---Thr(117) Asp(26)---Asn(120) Asp(26)---Lys(116)Ala(27)---Asn(120) Ala(27)---Ile(115) Glu(28)---Asn(120)Glu(28)---Arg(114) Thr(29)---Asn(120) Thr(29)---Thr(113)Glu(30)---Asn(120) Thr(29)---Asp(112) Phe(31)---Asn(120)Thr(29)---Leu(111) Met(32)---Asn(120) Thr(29)---Lys(110)Met(33)---Asn(120) Met(33)---Leu(109) Ser(34)---Asn(120)Ser(34)---Met(108) Lys(35)---Asn(120) Ser(34)---Arg(107)Leu(36)---Asn(120) Ser(34)---Met(106) Pro(37)---Asn(120)Ser(34)---Cys(105) Leu(38)---Asn(120) Ser(34)---Val(104)Glu(39)---Asn(120) Ser(34)---Gln(103) Asn(40)---Asn(120)Ser(34)---Val(102) Pro(41)---Asn(120) Ser(34)---Gln(101)Val(42)---Asn(120) Ser(34)---Lys(100) Leu(43)---Asn(120)Ser(34)---Asp(99) Leu(44)---Asn(120) Ser(34)---Ser(98)Asp(45)---Asn(120) Ser(34)---Pro(97) Arg(46)---Asn(120)Ser(34)---Asn(96) Phe(47)---Asn(120) Ser(34)---Ala(95)His(48)---Asn(120) Ser(34)---Cys(94) Ala(49)---Asn(120)Ser(34)---Phe(93) Thr(50)---Asn(120) Ser(34)---Arg(92)Ser(51)---Asn(120) Ser(34)---Arg(91) Ala(52)---Asn(120)Ser(34)---Gly(90) Asp(53)---Asn(120) Ser(34)---Lys(89) Ser(34)---Ile(84)Ser(34)---Ser(79) Ser(34)---Asn(75) Ser(34)---Phe(72) Ser(34)---Leu(68)

[0227] Substitution of amino acids

[0228] A further aspect of the present invention also includes thesubstitution of amino acids. Of special interest are conservative aminoacid substitutions that do not significantly affect the folding of theprotein. Examples of conservative amino acid substitutions known tothose skilled in the art are set forth Table 1, above.

[0229] Of additional special interest are also substitutions of chargedamino acids with another charged amino acid or with neutral amino acids.This may result in proteins with improved characteristics such as lessaggregation. Prevention of aggregation is highly desirable. Aggregationof proteins cannot only result in a reduced activity but be problematicwhen preparing pharmaceutical formulations because they can beimmunogenic (Pinckard et al., Clin. Exp. Immunol. 2:331-340 (1967),Robbins et al., Diabetes 36:838-845 (1987), Cleland et al., Crit. Rev.Therapeutic Drug Carrier Systems 10:307-377 (1993).

[0230] The MPIF-1 protein may contain one or several amino acidsubstitutions, deletions or additions, either from natural mutation orhuman manipulation. Examples of some preferred mutations are: Ala(21)MetAsp(53)Gly Thr(24)Ala Asp(53)Ser Lys(25)Asn Asp(53)Thr Asp(26)AlaAsp(53)Met Asp(45)Ala Ser(51)Gly Asp(45)Gly Ser(34)Gly Asp(45)SerGlu(30)Gln Asp(45)Thr Glu(28)Gln Asp(45)Met Asp(53)Ala

[0231] M-CIF Variants

[0232] In order to improve or alter the characteristics of the M-CIFpolypeptide(s), protein engineering may be employed. Recombinant DNAtechnology known to those skilled in the art can be used to create novelproteins. Muteins and deletions or fusion proteins can show, e.g.,enhanced activity or increased stability. In addition, they could bepurified in higher yields and show better solubility at least undercertain purification and storage conditions. Set below are examples ofmutations that can be constructed.

[0233] M-CIF Amino terminal and carboxyterminal deletions

[0234] Interferon gamma shows up to ten times higher activities bydeleting 8-10 amino acid residues from the carboxy terminus of theprotein (Döbeli et al., J. of Biotechnology 7:199-216 (1988). Ron etal., J. Biol. Chem., 268(4):2984-2988 (1993) reported modified KGFproteins that had heparin binding activity even if 3, 8, or 27 aminoterminal amino acid residues were missing. Many other examples are knownto anyone skilled in the art.

[0235] Particularly preferred variants of M-CIF polypeptides of somepreferred mutations are: Gly(19)---Asn(94) Arg(27)---Asn(94)Gly(19)---Glu(93) Ser(24)---Lys(92) Thr(20)---Asn(94) Gly(28)---Asn(94)Thr(20)---Glu(93) Ser(25)---Glu(93) Lys(21)---Asn(94) Pro(29)---Asn(94)Thr(20)---Lys(92) Ser(25)---Lys(92) Thr(22)---Asn(94) Tyr(30)---Asn(94)Thr(20)---Lys(81) Ser(25)---Met(91) Glu(23)---Asn(94) His(31)---Asn(94)Thr(20)---Cys(75) Ser(25)---Lys(89) Ser(24)---Asn(94) Pro(32)---Asn(94)Lys(21)---Glu(92) Ser(25)---Lys(81) Ser(25)---Asn(94) Ser(33)---Asn(94)Thr(22)---Lys(92) Ser(25)---Cys(75) Ser(26)---Asn(94) Glu(34)---Asn(94)Glu(23)---Lys(92) Ser(26)---Cys(75)

[0236] An M-CIF polypeptide can contain one or several amino acidsubstitutions, deletions or additions, either from natural mutation orhuman manipulation. Examples of some preferred mutations are: Gly(19)MetAsp(51)Thr Thr(20)Ala Asp(51)Met Lys(21)Asn Lys(81)Asn Glu(23)GlnLys(81)Ala Ser(24)Ala Lys(89)Asn Ser(24)Met Lys(89)Ala Ser(25)AlaLys(92)Ala Ser(25)Gly Pro(32)Glu Glu(34)Gln Ser(33)Leu Lys(43)AlaGlu(34)Arg Asp(51)Ala Asp(51)Gly Asp(51)Ser

[0237] The polypeptides of the present invention are preferably providedin an isolated form, and preferably are substantially purified. Arecombinantly produced version of the MPIF-1, M-CIF or MIP-4 polypeptidecan be substantially purified by the one-step method described in Smithand Johnson, Gene 67:31-40 (1988).

[0238] The polypeptides of the present invention include the polypeptideencoded by the deposited cDNA including the leader, the maturepolypeptide encoded by the deposited the cDNA minus the leader (i.e.,the mature protein), the polypeptide of FIG. 1 (SEQ ID NO:4), FIG. 2(SEQ ID NO:2) or FIG. 3 (SEQ ID NO:6) including the leader, thepolypeptide of FIG. 1 (SEQ ID NO:4), FIG. 2 (SEQ ID NO:2) or FIG. 3 (SEQID NO:6) minus the leader, as well as polypeptides which have at least90% similarity, more preferably at least 95% similarity, and still morepreferably at least 96%, 97%, 98% or 99% similarity to those describedabove. Further polypeptides of the present invention includepolypeptides at least 80% identical, more preferably at least 90% or 95%identical, still more preferably at least 96%, 97%, 98% or 99% identicalto the polypeptide encoded by the deposited cDNA, to the polypeptide ofFIG. 1 (SEQ ID NO:4), FIG. 2 (SEQ ID NO:2) or FIG. 3 (SEQ ID NO:6) andalso include portions of such polypeptides with at least 30 amino acidsand more preferably at least 50 amino acids.

[0239] By “% similarity” for two polypeptides is intended a similarityscore produced by comparing the amino acid sequences of the twopolypeptides using the Bestfit program (Wisconsin Sequence AnalysisPackage, Version 8 for Unix, Genetics Computer Group, UniversityResearch Park, 575 Science Drive, Madison, Wis. 53711) and the defaultsettings for determining similarity. Bestfit uses the local homologyalgorithm of Smith and Waterman (Advances in Applied Mathematics2:482-489, 1981) to find the best segment of similarity between twosequences.

[0240] By a polypeptide having an amino acid sequence at least, forexample, 95% “identical” to a reference amino acid sequence of anMPIF-1, M-CIF or MIP-4 polypeptide is intended that the amino acidsequence of the polypeptide is identical to the reference sequenceexcept that the polypeptide sequence may include up to five amino acidalterations per each 100 amino acids of the reference amino acid of theMPIF-1, M-CIF or MIP-4 polypeptide. In other words, to obtain apolypeptide having an amino acid sequence at least 95% identical to areference amino acid sequence, up to 5% of the amino acid residues inthe reference sequence may be deleted or substituted with another aminoacid, or a number of amino acids up to 5% of the total amino acidresidues in the reference sequence may be inserted into the referencesequence. These alterations of the reference sequence may occur at theamino or carboxy terminal positions of the reference amino acid sequenceor anywhere between those terminal positions, interspersed eitherindividually among residues in the reference sequence or in one or morecontiguous groups within the reference sequence.

[0241] As a practical matter, whether any particular polypeptide is atleast 90%, 95%, 96%, 97%, 98% or 99% identical to, for instance, theamino acid sequence shown in FIG. 1 (SEQ ID NO:4), FIG. 2 (SEQ ID NO:2)or FIG. 3 (SEQ ID NO:6) or to the amino acid sequence encoded bydeposited CDNA clones can be determined conventionally using knowncomputer programs such the Bestfit program (Wisconsin Sequence AnalysisPackage, Version 8 for Unix, Genetics Computer Group, UniversityResearch Park, 575 Science Drive, Madison, Wis. 53711. When usingBestfit or any other sequence alignment program to determine whether aparticular sequence is, for instance, 95% identical to a referencesequence according to the present invention, the parameters are set, ofcourse, such that the percentage of identity is calculated over the fulllength of the reference amino acid sequence and that gaps in homology ofup to 5% of the total number of amino acid residues in the referencesequence are allowed.

[0242] The polypeptide of the present invention could be used as amolecular weight marker on SDS-PAGE gels or on molecular sieve gelfiltration columns using methods well known to those of skill in theart.

[0243] As described in detail below, the polypeptides of the presentinvention can also be used to raise polyclonal and monoclonalantibodies, which are useful in assays for detecting MPIF-1, M-CIF orMIP-4 protein expression as described below or as agonists andantagonists capable of enhancing or inhibiting MPIF-1, M-CIF or MIP-4protein function. Further, such polypeptides can be used in the yeasttwo-hybrid system to “capture” MPIF-1, M-CIF or MIP-4 protein bindingproteins which are also candidate agonist and antagonist according tothe present invention. The yeast two hybrid system is described inFields and Song, Nature 340:245-246 (1989).

[0244] MPIF-1, M-CIF and MIP-4 Epitope-Bearing Polypeptides

[0245] In another aspect, the invention provides a peptide orpolypeptide comprising an epitope-bearing portion of a polypeptide ofthe invention. The epitope of this polypeptide portion is an immunogenicor antigenic epitope of a polypeptide of the invention. An “immunogenicepitope” is defined as a part of a protein that elicits an antibodyresponse when the whole protein is the immunogen. These immunogenicepitopes are believed to be confined to a few loci on the molecule. Onthe other hand, a region of a protein molecule to which an antibody canbind is defined as an “antigenic epitope.” The number of immunogenicepitopes of a protein generally is less than the number of antigenicepitopes. See, for instance, Geysen et al., Proc. Natl. Acad. Sci. USA81:3998-4002 (1983).

[0246] As to the selection of peptides or polypeptides bearing anantigenic epitope (i.e., that contain a region of a protein molecule towhich an antibody can bind), it is well known in that art thatrelatively short synthetic peptides that mimic part of a proteinsequence are routinely capable of eliciting an antiserum that reactswith the partially mimicked protein. See, e.g., Sutcliffe, J. G.,Shinnick, T. M., Green, N. and Learner, R. A., Science 219:660-666(1983).

[0247] Peptides capable of eliciting protein-reactive sera arefrequently represented in the primary sequence of a protein, can becharacterized by a set of simple chemical rules, and are confinedneither to immunodominant regions of intact proteins (i.e., immunogenicepitopes) nor to the amino or carboxyl terminals. Peptides that areextremely hydrophobic and those of six or fewer residues generally areineffective at inducing antibodies that bind to the mimicked protein;longer, peptides, especially those containing proline residues, usuallyare effective. Sutcliffe et al., supra, at 661. For instance, 18 of 20peptides designed according to these guidelines, containing 8-39residues covering 75% of the sequence of the influenza virushemagglutinin HA1 polypeptide chain, induced antibodies that reactedwith the HA1 protein or intact virus; and 12/12 peptides from the MuLVpolymerase and 18/18 from the rabies glycoprotein induced antibodiesthat precipitated the respective proteins.

[0248] Antigenic epitope-bearing peptides and polypeptides of theinvention are therefore useful to raise antibodies, including monoclonalantibodies, that bind specifically to a polypeptide of the invention.Thus, a high proportion of hybridomas obtained by fusion of spleen cellsfrom donors immunized with an antigen epitope-bearing peptide generallysecrete antibody reactive with the native protein. Sutcliffe et al.,supra, at 663. The antibodies raised by antigenic epitope-bearingpeptides or polypeptides are useful to detect the mimicked protein, andantibodies to different peptides may be used for tracking the fate ofvarious regions of a protein precursor which undergoespost-translational processing. The peptides and anti-peptide antibodiesmay be used in a variety of qualitative or quantitative assays for themimicked protein, for instance in competition assays since it has beenshown that even short peptides (e.g. about 9 amino acids) can bind anddisplace the larger peptides in immunoprecipitation assays. See, forinstance, Wilson et al., Cell 37:767-778 (1984) at 777. The anti-peptideantibodies of the invention also are useful for purification of themimicked protein, for instance, by adsorption chromatography usingmethods well known in the art.

[0249] Antigenic epitope-bearing peptides and polypeptides of theinvention designed according to the above guidelines preferably containa sequence of at least seven, more preferably at least nine and mostpreferably between about 15 to about 30 amino acids contained within theamino acid sequence of a polypeptide of the invention. However, peptidesor polypeptides comprising a larger portion of an amino acid sequence ofa polypeptide of the invention, containing about 30 to about 50 aminoacids, or any length up to and including the entire amino acid sequenceof a polypeptide of the invention, also are considered epitope-bearingpeptides or polypeptides of the invention and also are useful forinducing antibodies that react with the mimicked protein. Preferably,the amino acid sequence of the epitope-bearing peptide is selected toprovide substantial solubility in aqueous solvents (i.e., the sequenceincludes relatively hydrophilic residues and highly hydrophobicsequences are preferably avoided); and sequences containing prolineresidues are particularly preferred.

[0250] Non-limiting examples of antigenic polypeptides or peptides thatcan be used to generate MPIF-1-specific antibodies include: apolypeptide comprising amino acid residues from about 21 to about 30 inFIG. 1 (SEQ ID NO:4); a polypeptide comprising amino acid residues fromabout 31 to about 44 in FIG. 1 (SEQ ID NO:4); a polypeptide comprisingamino acid residues from about 49 to about 55 in FIG. 1 (SEQ ID NO:4); apolypeptide comprising amino acid residues from about 59 to about 67 inFIG. 1 (SEQ ID NO:4); a polypeptide comprising amino acid residues fromabout 72 to about 83 in FIG. 1 (SEQ ID NO:4); a polypeptide comprisingamino acid residues from about 86 to about 103 in FIG. 1 (SEQ ID NO:4);a polypeptide comprising amino acid residues from about 110 to about 120in FIG. 1 (SEQ ID NO:4). As indicated above, the inventors havedetermined that the above polypeptide fragments are antigenic regions ofthe MPIF-1 protein.

[0251] Non-limiting examples of antigenic polypeptides or peptides thatcan be used to generate M-CIF-specific antibodies include: a polypeptidecomprising amino acid residues from about 20 to about 36 in FIG. 2 (SEQID NO:2); a polypeptide comprising amino acid residues from about 42 toabout 52 in FIG. 2 (SEQ ID NO:2); a polypeptide comprising amino acidresidues from about 52 to about 64 in FIG. 2 (SEQ ID NO:2); apolypeptide comprising amino acid residues from about 67 to about 75 inFIG. 2 (SEQ ID NO:2); a polypeptide comprising amino acid residues fromabout 75 to about 84 in FIG. 2 (SEQ ID NO:2); and a polypeptidecomprising amino acid residues from about 86 to about 93 in FIG. 2 (SEQID NO:2). As indicated above, the inventors have determined that theabove polypeptide fragments are antigenic regions of the M-CIF protein.

[0252] The epitope-bearing peptides and polypeptides of the inventionmay be produced by any conventional means for making peptides orpolypeptides including recombinant means using nucleic acid molecules ofthe invention. For instance, a short epitope-bearing amino acid sequencemay be fused to a larger polypeptide which acts as a carrier duringrecombinant production and purification, as well as during immunizationto produce anti-peptide antibodies. Epitope-bearing peptides also may besynthesized using known methods of chemical synthesis. For instance,Houghten has described a simple method for synthesis of large numbers ofpeptides, such as 10-20 mg of 248 different 13 residue peptidesrepresenting single amino acid variants of a segment of the HA1polypeptide which were prepared and characterized (by ELISA-type bindingstudies) in less than four weeks. Houghten, R. A. (1985) General methodfor the rapid solid-phase synthesis of large numbers of peptides:specificity of antigen-antibody interaction at the level of individualamino acids. Proc. Natl. Acad. Sci. USA 82:5131-5135. This “SimultaneousMultiple Peptide Synthesis (SMPS)” process is further described in U.S.Pat. No. 4,631,211 to Houghten et al. (1986). In this procedure theindividual resins for the solid-phase synthesis of various peptides arecontained in separate solvent-permeable packets, enabling the optimaluse of the many identical repetitive steps involved in solid-phasemethods. A completely manual procedure allows 500-1000 or more synthesesto be conducted simultaneously. Houghten et al., supra, at 5134.

[0253] Preferred nucleic acid fragments of the present invention includenucleic acid molecules encoding epitope-bearing portions of the MPIF-1,M-CIF or MIP-4 protein.

[0254] In particular, such nucleic acid fragments of the MPIF-1 of thepresent invention include nucleic acid molecules encoding: a polypeptidecomprising amino acid residues from about 21 to about 30 in FIG. 1 (SEQID NO:4); a polypeptide comprising amino acid residues from about 31 toabout 44 in FIG. 1 (SEQ ID NO:4); a polypeptide comprising amino acidresidues from about 49 to about 55 in FIG. 1 (SEQ ID NO:4); apolypeptide comprising amino acid residues from about 59 to about 67 inFIG. 1 (SEQ ID NO:4);a polypeptide comprising amino acid residues fromabout 72 to about 83 in FIG. 1 (SEQ ID NO:4); a polypeptide comprisingamino acid residues from about 86 to about 103 in FIG. 1 (SEQ ID NO:4);a polypeptide comprising amino acid residues from about 110 to about 120in FIG. 1 (SEQ ID NO:4), or any range or value therein.

[0255] In particular, such nucleic acid fragments of the MPIF-1 of thepresent invention include nucleic acid molecules encoding: a polypeptidecomprising amino acid residues from about 20 to about 36 in FIG. 2 (SEQID NO:2); a polypeptide comprising amino acid residues from about 42 toabout 52 in FIG. 2 (SEQ ID NO:2); a polypeptide comprising amino acidresidues from about 52 to about 64 in FIG. 2 (SEQ ID NO:2);a polypeptidecomprising amino acid residues from about 67 to about 75 in FIG. 2 (SEQID NO:2);a polypeptide comprising amino acid residues from about 75 toabout 84 in FIG. 2 (SEQ ID NO:2); and a polypeptide comprising aminoacid residues from about 86 to about 93 in FIG. 2 (SEQ ID NO:2), or anyrange or value therein.

[0256] The inventors have determined that the above polypeptidefragments are antigenic regions of the MPIF-1, M-CIF or MIP-4 protein.Methods for determining other such epitope-bearing portions of theMPIF-1, M-CIF or MIP-4 protein are described in detail below.

[0257] Methods for determining other such epitope-bearing portions of anMPIF-1, M-CIF or MIP-4 polypeptide are described herein.

[0258] Epitope-bearing peptides and polypeptides of the invention areused to induce antibodies according to methods well known in the art.See, for instance, Sutcliffe et al., supra; Wilson et al., supra; Chow,M. et al., Proc. Natl. Acad. Sci. USA 82:910-914; and Bittle, F. J. etal., J. Gen. Virol. 66:2347-2354 (1985). Generally, animals may beimmunized with free peptide; however, anti-peptide antibody titer may beboosted by coupling of the peptide to a macromolecular carrier, such askeyhole limpet hemacyanin (KLH) or tetanus toxoid. For instance,peptides containing cysteine may be coupled to carrier using a linkersuch as m-maleimidobenzoyl-N-hydroxysuccinimide ester (MBS), while otherpeptides may be coupled to carrier using a more general linking agentsuch as glutaraldehyde. Animals such as rabbits, rats and mice areimmunized with either free or carrier-coupled peptides, for instance, byintraperitoneal and/or intradermal injection of emulsions containingabout 100 g peptide or carrier protein and Freund's adjuvant. Severalbooster injections may be needed, for instance, at intervals of abouttwo weeks, to provide a useful titer of anti-peptide antibody which canbe detected, for example, by ELISA assay using free peptide adsorbed toa solid surface. The titer of anti-peptide antibodies in serum from animmunized animal may be increased by selection of anti-peptideantibodies, for instance, by adsorption to the peptide on a solidsupport and elution of the selected antibodies according to methods wellknown in the art.

[0259] Immunogenic epitope-bearing peptides of the invention, i.e.,those parts of a protein that elicit an antibody response when the wholeprotein is the immunogen, are identified according to methods known inthe art. For instance, Geysen et al., supra, discloses a procedure forrapid concurrent synthesis on solid supports of hundreds of peptides ofsufficient purity to react in an enzyme-linked immunosorbent assay.Interaction of synthesized peptides with antibodies is then easilydetected without removing them from the support. In this manner apeptide bearing an immunogenic epitope of a desired protein may beidentified routinely by one of ordinary skill in the art. For instance,the immunologically important epitope in the coat protein offoot-and-mouth disease virus was located by Geysen et al. with aresolution of seven amino acids by synthesis of an overlapping set ofall 208 possible hexapeptides covering the entire 213 amino acidsequence of the protein. Then, a complete replacement set of peptides inwhich all 20 amino acids were substituted in turn at every positionwithin the epitope were synthesized, and the particular amino acidsconferring specificity for the reaction with antibody were determined.Thus, peptide analogs of the epitope-bearing peptides of the inventioncan be made routinely by this method. U.S. Pat. No. 4,708,781 to Geysen(1987) further describes this method of identifying a peptide bearing animmunogenic epitope of a desired protein.

[0260] Further still, U.S. Pat. No. 5,194,392 to Geysen (1990) describesa general method of detecting or determining the sequence of monomers(amino acids or other compounds) which is a topological equivalent ofthe epitope (i.e., a “mimotope”) which is complementary to a particularparatope (antigen binding site) of an antibody of interest. Moregenerally, U.S. Pat. No. 4,433,092 to Geysen (1989) describes a methodof detecting or determining a sequence of monomers which is atopographical equivalent of a ligand which is complementary to theligand binding site of a particular receptor of interest. Similarly,U.S. Pat. No. 5,480,971 to Houghten, R. A. et al. (1996) on PeralkylatedOligopeptide Mixtures discloses linear C₁-C₇-alkyl peralkylatedoligopeptides and sets and libraries of such peptides, as well asmethods for using such oligopeptide sets and libraries for determiningthe sequence of a peralkylated oligopeptide that preferentially binds toan acceptor molecule of interest. Thus, non-peptide analogs of theepitope-bearing peptides of the invention also can be made routinely bythese methods.

[0261] The entire disclosure of each document cited in this section on“Polypeptides and Peptides” is hereby incorporated herein by reference.

[0262] As one of skill in the art will appreciate, MPIF-1, M-CIF orMIP-4 polypeptides of the present invention and the epitope-bearingfragments thereof described above can be combined with parts of theconstant domain of immunoglobulins (IgG), resulting in chimericpolypeptides. These fusion proteins facilitate purification and show anincreased half-life in vivo. This has been shown, e.g. for chimericproteins consisting of the first two domains of the humanCD4-polypeptide and various domains of the constant regions of the heavyor light chains of mammalian immunoglobulins (EPA 394,827; Traunecker etal., Nature 331:84-86 (1988)). Fusion proteins that have adisulfide-linked dimeric structure due to the IgG part can also be moreefficient in binding and neutralizing other molecules than the monomericMPIF-1, M-CIF or MIP-4 protein or protein fragment alone (Fountoulakiset al., J. Biochem 270:3958-3964 (1995)).

[0263] Polypeptide Purification and Isolation

[0264] MPIF-1, MIP-4 and M-CIF are recovered and purified fromrecombinant cell cultures by methods including ammonium sulfate orethanol precipitation, acid extraction, anion or cation exchangechromatography, phosphocellulose chromatography, hydrophobic interactionchromatography, affinity chromatography hydroxylapatite chromatographyand lectin chromatography. Protein refolding steps can be used, asnecessary, in completing configuration of the mature protein. Finally,high performance liquid chromatography (HPLC) can be employed for finalpurification steps.

[0265] The polypeptides of the present invention can be a naturallypurified product, or a product of chemical synthetic procedures, orproduced by recombinant techniques from a prokaryotic or eukaryotic host(for example, by bacterial, yeast, higher plant, insect and mammaliancells in culture). Depending upon the host employed in a recombinantproduction procedure, the polypeptides of the present invention can beglycosylated with mammalian or other eukaryotic carbohydrates or can benon-glycosylated. Polypeptides of the invention can also include aninitial methionine amino acid residue.

[0266] Antibodies

[0267] MPIF-1, M-CIF or MIP-4-protein specific antibodies for use in thepresent invention can be raised against the intact MPIF-1, M-CIF orMIP-4 protein or an antigenic polypeptide fragment thereof, which maypresented together with a carrier protein, such as an albumin, to ananimal system (such as rabbit or mouse) or, if it is long enough (atleast about 25 amino acids), without a carrier.

[0268] As used herein, the term “antibody” (Ab) or “monoclonal antibody”(Mab) is meant to include intact molecules as well as antibody fragments(such as, for example, Fab and F(ab′)₂ fragments) which are capable ofspecifically binding to MPIF-1, M-CIF or MIP-4 protein. Fab and F(ab′)₂fragments lack the Fc fragment of intact antibody, clear more rapidlyfrom the circulation, and may have less non-specific tissue binding ofan intact antibody (Wahl et al., J. Nucl. Med. 24:316-325 (1983)). Thus,these fragments are preferred.

[0269] The polypeptides, their fragments or other derivatives, oranalogs thereof, or cells expressing them can be used as an immunogen toproduce antibodies thereto. These antibodies can be, for example,polyclonal or monoclonal antibodies. The present invention also includeschimeric, single chain and humanized antibodies, as well as Fabfragments, or the product of an Fab expression library. Variousprocedures known in the art can be used for the production of suchantibodies and fragments.

[0270] Antibodies generated against the polypeptides corresponding to asequence of the present invention or its in vivo receptor can beobtained by direct injection of the polypeptides into an animal or byadministering the polypeptides to an animal, preferably a nonhuman. Theantibody so obtained will then bind the polypeptides itself. In thismanner, even a sequence encoding only a fragment of the polypeptides canbe used to generate antibodies binding the whole native polypeptides.Such antibodies can then be used to isolate the polypeptides from tissueexpressing that polypeptide.

[0271] For preparation of monoclonal antibodies, any technique whichprovides antibodies produced by continuous cell line cultures can beused. Examples include the hybridoma technique (Kohler and Milstein,1975, Nature, 256:495-497), the trioma technique, the human B-cellhybridoma technique (Kozbor et al., 1983, Immunology Today 4:72), andthe EBV-hybridoma technique to produce human monoclonal antibodies(Cole, et al., 1985, in Monoclonal Antibodies and Cancer Therapy, AlanR. Liss, Inc., pp. 77-96).

[0272] Techniques described for the production of single chainantibodies (U.S. Pat. No. 4,946,778) can be adapted to produce singlechain antibodies to immunogenic polypeptides products of this invention.

[0273] The antibodies of the present invention may be prepared by any ofa variety of methods. For example, cells expressing the MPIF-1, M-CIF orMIP-4 protein or an antigenic fragment thereof can be administered to ananimal in order to induce the production of sera containing polyclonalantibodies. In a preferred method, a preparation of MPIF-1, M-CIF orMIP-4 protein is prepared and purified to render it substantially freeof natural contaminants. Such a preparation is then introduced into ananimal in order to produce polyclonal antisera of greater specificactivity.

[0274] In the most preferred method, the antibodies of the presentinvention are monoclonal antibodies (or MPIF-1, M-CIF or MIP-4 proteinbinding fragments thereof). Such monoclonal antibodies can be preparedusing hybridoma technology (Kohler et al, Nature 256:495 (1975); Kohleret al., Eur. J. Immunol. 6:511 (1976); Kohler et al., Eur. J. Immunol.6:292 (1976); Hammerling et al., In: Monoclonal Antibodies and T-CellHybridomas, Elsevier, N.Y., (1981) pp. 563-681 ). In general, suchprocedures involve immunizing an animal (preferably a mouse) with anMPIF-1, M-CIF or MIP-4 protein antigen or, more preferably, with anMPIF-1, M-CIF or MIP-4 protein-expressing cell. Suitable cells can berecognized by their capacity to bind anti-MPIF-1, M-CIF or MIP-4 proteinantibody. Such cells may be cultured in any suitable tissue culturemedium; however, it is preferable to culture cells in Earle's modifiedEagle's medium supplemented with 10% fetal bovine serum (inactivated atabout 56° C.), and supplemented with about 10 g/l of nonessential aminoacids, about 1,000 U/ml of penicillin, and about 100 g/ml ofstreptomycin. The splenocytes of such mice are extracted and fused witha suitable myeloma cell line. Any suitable myeloma cell line may beemployed in accordance with the present invention; however, it ispreferable to employ the parent myeloma cell line (SP20), available fromthe American Type Culture Collection, Rockville, Md. After fusion, theresulting hybridoma cells are selectively maintained in HAT medium, andthen cloned by limiting dilution as described by Wands et al.(Gastroenterology 80:225-232 (1981)). The hybridoma cells obtainedthrough such a selection are then assayed to identify clones whichsecrete antibodies capable of binding the MPIF-1, M-CIF or MIP-4 proteinantigen.

[0275] Alternatively, additional antibodies capable of binding to theMPIF-1, M-CIF or MIP-4 protein antigen may be produced in a two-stepprocedure through the use of anti-idiotypic antibodies. Such a methodmakes use of the fact that antibodies are themselves antigens, and that,therefore, it is possible to obtain an antibody which binds to a secondantibody. In accordance with this method, MPIF-1, M-CIF or MIP-4-proteinspecific antibodies are used to immunize an animal, preferably a mouse.The splenocytes of such an animal are then used to produce hybridomacells, and the hybridoma cells are screened to identify clones whichproduce an antibody whose ability to bind to the MPIF-1, M-CIF or MIP-4protein-specific antibody can be blocked by the MPIF-1, M-CIF or MIP-4protein antigen. Such antibodies comprise anti-idiotypic antibodies tothe MPIF-1, M-CIF or MIP-4 protein-specific antibody and can be used toimmunize an animal to induce formation of further MPIF-1, M-CIF or MIP-4protein-specific antibodies.

[0276] It will be appreciated that Fab and F(ab′)₂ and other fragmentsof the antibodies of the present invention may be used according to themethods disclosed herein. Such fragments are typically produced byproteolytic cleavage, using enzymes such as papain (to produce Fabfragments) or pepsin (to produce F(ab′)₂ fragments). Alternatively,MPIF-1, M-CIF or MIP-4 protein-binding fragments can be produced throughthe application of recombinant DNA technology or through syntheticchemistry.

[0277] It may be preferable to use “humanized” chimeric monoclonalantibodies. Such antibodies can be produced using genetic constructsderived from hybridoma cells producing the monoclonal antibodiesdescribed above. Methods for producing chimeric antibodies are known inthe art. See, for review, Morrison, Science 229:1202 (1985); Oi et al.,BioTechniques 4:214 (1986); Cabilly et al., U.S. Pat. No. 4,816,567;Taniguchi et al., EP 171496; Morrison et al., EP 173494; Neuberger etal., WO 8601533; Robinson et al., WO 8702671; Boulianne et al., Nature312:643 (1984); Neuberger et al., Nature 314:268 (1985).

[0278] Further suitable labels for the MPIF-1, M-CIF or MIP-4protein-specific antibodies of the present invention are provided below.Examples of suitable enzyme labels include malate dehydrogenase,staphylococcal nuclease, delta-5-steroid isomerase, yeast-alcoholdehydrogenase, alpha-glycerol phosphate dehydrogenase, triose phosphateisomerase, peroxidase, alkaline phosphatase, asparaginase, glucoseoxidase, beta-galactosidase, ribonuclease, urease, catalase,glucose-6-phosphate dehydrogenase, glucoamylase, and acetylcholineesterase.

[0279] Examples of suitable radioisotopic labels include ³H, ¹¹¹In,¹²⁵I, ¹³¹I, ³²P, ³⁵S, ¹⁴C, ⁵¹Cr, ⁵⁷To, ⁵⁸Co, ⁵⁹Fe, ⁷⁵Se, ²⁵²Eu, ⁹⁰Y,⁶⁷Cu, ²¹⁷Ci, ¹¹At, ²¹²Pb, ⁴⁷Sc, ¹⁰⁹Pd, etc. ¹¹¹In is a preferred isotopewhere in vivo imaging is used since its avoids the problem ofdehalogenation of the ¹²⁵I or ¹³¹I-labeled monoclonal antibody by theliver. In addition, this radionucleotide has a more favorable gammaemission energy for imaging (Perkins et al., Eur. J. Nucl. Med.10:296-301 (1985); Carasquillo et al., J. Nucl. Med. 28:281-287 (1987)).

[0280] Examples of suitable non-radioactive isotopic labels include¹⁵⁷Gd, ⁵⁵Mn, ¹⁶²Dy, ⁵²Tr, and ⁵⁶Fe.

[0281] Examples of suitable fluorescent labels include an ¹⁵²Eu label, afluorescein label, an isothiocyanate label, a rhodamine label, aphycoerythrin label, a phycocyanin label, an allophycocyanin label, ano-phthaldehyde label, and a fluorescamine label.

[0282] Examples of suitable toxin labels include diphtheria toxin,ricin, and cholera toxin.

[0283] Examples of chemiluminescent labels include a luminal label, anisoluminal label, an aromatic acridinium ester label, an imidazolelabel, an acridinium salt label, an oxalate ester label, a luciferinlabel, a luciferase label, and an aequorin label.

[0284] Examples of nuclear magnetic resonance contrasting agents includeheavy metal nuclei such as Gd, Mn, and iron.

[0285] Typical techniques for binding the above-described labels toantibodies are provided by Kennedy et al., Clin. Chim. Acta 70:1-31(1976), and Schurs et al., Clin. Chim. Acta 81:1-40 (1977). Couplingtechniques mentioned in the latter are the glutaraldehyde method, theperiodate method, the dimaleimide method, them-maleimidobenzyl-N-hydroxy-succinimide ester method, all of whichmethods are incorporated by reference herein.

[0286] Chromosome Assays

[0287] The nucleic acid molecules of the present invention are alsovaluable for chromosome identification. The sequence is specificallytargeted to and can hybridize with a particular location on anindividual human chromosome. Moreover, there is a current need foridentifying particular sites on the chromosome. Few chromosome markingreagents based on actual sequence data (repeat polymorphisms) arepresently available for marking chromosomal location. The mapping ofDNAs to chromosomes according to the present invention is an importantfirst step in correlating those sequences with genes associated withdisease.

[0288] In certain preferred embodiments in this regard, the cDNA hereindisclosed is used to clone genomic DNA of an MPIF-1, M-CIF or MIP-4protein gene. This can be accomplished using a variety of well knowntechniques and libraries, which generally are available commercially.The genomic DNA then is used for in situ chromosome mapping using wellknown techniques for this purpose. Typically, in accordance with routineprocedures for chromosome mapping, some trial and error may be necessaryto identify a genomic probe that gives a good in situ hybridizationsignal.

[0289] Briefly, sequences can be mapped to chromosomes by preparing PCRprimers (preferably 15-25 bp) from the cDNA. Computer analysis of thecDNA is used to rapidly select primers that do not span more than oneexon in the genomic DNA, thus complicating the amplification process.These primers are then used for PCR screening of somatic cell hybridscontaining individual human chromosomes. Only those hybrids containingthe human gene corresponding to the primer will yield an amplifiedfragment.

[0290] PCR mapping of somatic cell hybrids is a rapid procedure forassigning a particular DNA to a particular chromosome. Using the presentinvention with the same oligonucleotide primers, sublocalization can beachieved with panels of portions from specific chromosomes or pools oflarge genomic clones in an analogous manner. Other mapping strategiesthat can similarly be used to map to its chromosome include in situhybridization, prescreening with labeled flow-sorted chromosomes andpreselection by hybridization to construct chromosome specific-cDNAlibraries.

[0291] Fluorescence in situ hybridization (“FISH”) of a cDNA clone to ametaphase chromosomal spread can be used to provide a precisechromosomal location in one step. This technique can be used with probesfrom the cDNA as short as 50 or 60 bp. For a review of this technique,see Verma et al., Human Chromosomes: A Manual Of Basic Techniques,Pergamon Press, New York (1988).

[0292] Once a sequence has been mapped to a precise chromosomallocation, the physical position of the sequence on the chromosome can becorrelated with genetic map data. Such data are found, for example, inV. McKusick, Mendelian Inheritance In Man, available on-line throughJohns Hopkins University, Welch Medical Library. The relationshipbetween genes and diseases that have been mapped to the same chromosomalregion are then identified through linkage analysis (coinheritance ofphysically adjacent genes).

[0293] Next, it is necessary to determine the differences in the cDNA orgenomic sequence between affected and unaffected individuals. If amutation is observed in some or all of the affected individuals but notin any normal individuals, then the mutation is likely to be thecausative agent of the disease.

[0294] With current resolution of physical mapping and genetic mappingtechniques, a cDNA precisely localized to a chromosomal regionassociated with the disease could be one of between 50 and 500 potentialcausative genes. This assumes 1 megabase mapping resolution and one geneper 20 kb.

[0295] Comparison of affected and unaffected individuals generallyinvolves first looking for structural alterations in the chromosomes,such as deletions or translocations that are visible from chromosomespreads or detectable using PCR based on that cDNA sequence. Ultimately,complete sequencing of genes from several individuals is required toconfirm the presence of a mutation and to distinguish mutations frompolymorphisms.

[0296] The present invention is further directed to inhibiting MPIF-1,MIP-4 and M-CIF in vivo by the use of antisense technology. Antisensetechnology can be used to control gene expression through triple-helixformation or antisense DNA or RNA, both of which methods are based onbinding of a polynucleotide to DNA or RNA. For example, the 5′ codingportion of the polynucleotide sequence, which encodes for thepolypeptides of the present invention, is used to design an antisenseRNA oligonucleotide of from about 10 to 40 base pairs in length. A DNAoligonucleotide is designed to be complementary to a region of the geneinvolved in transcription (triple helix -see Lee et al., Nucl. AcidsRes., 6:3073 (1979); Cooney et al, Science, 241:456 (1988); and Dervanet al., Science, 251: 1360 (1991)), thereby preventing transcription andthe production of MPIF-1, MIP-4 and M-CIF. The antisense RNAoligonucleotide hybridizes to the mRNA in vivo and blocks translation ofthe mRNA molecule into the MPIF-1, MIP-4 and M-CIF (antisense—Okano, J.Neurochem., 56:560 (1991); Oligodeoxynucleotides as Antisense Inhibitorsof Gene Expression, CRC Press, Boca Raton, Fla. (1988)).

[0297] Alternatively, the oligonucleotides described above can bedelivered to cells by procedures in the art such that the antisense RNAor DNA can be expressed in vivo to inhibit production of MPIF-1, MIP-4and M-CIF in the manner described above.

[0298] Accordingly, antisense constructs to the MPIF-1, MIP-4 and M-CIFcan be used to treat disorders which are either MPIF-1 -, MIP-4- and/orM-CIF-induced or enhanced, for example, atherosclerosis, auto-immune,e.g. multiple sclerosis and insulin-dependent diabetes, and chronicinflammatory and infective diseases, histamine-mediated allergicreactions, rheumatoid arthritis, silicosis, sarcoidosis, idiopathicpulmonary fibrosis and other chronic inflammatory diseases of the lung,idiopathic hyper-eosinophilic syndrome, endotoxic shock,histamine-mediated allergic reactions, prostaglandin-independent fever,and aplastic anemia and other cases of bone marrow failure.

[0299] Antagonists, Agonists and Methods

[0300] This invention further provides methods for screening compoundsto identify agonists and antagonists to the chemokine polypeptides ofthe present invention. An agonist is a compound which has similarbiological functions, or enhances the functions, of the polypeptides,while antagonists block such functions. Chemotaxis may be assayed byplacing cells, which are chemoattracted by either of the polypeptides ofthe present invention, on top of a filter with pores of sufficientdiameter to admit the cells (about 5 μm). Solutions of potentialagonists are placed in the bottom of the chamber with an appropriatecontrol medium in the upper compartment, and thus a concentrationgradient of the agonist is measured by counting cells that migrate intoor through the porous membrane over time.

[0301] When assaying for antagonists, the chemokine polypeptides of thepresent invention are placed in the bottom chamber and the potentialantagonist is added to determine if chemotaxis of the cells isprevented.

[0302] Alternatively, a mammalian cell or membrane preparationexpressing the receptors of the polypeptides would be incubated with alabeled chemokine polypeptide, e.g. radioactivity, in the presence ofthe compound. The ability of the compound to block this interactioncould then be measured. When assaying for agonists in this fashion, thechemokines would be absent and the ability of the agonist itself tointeract with the receptor could be measured.

[0303] Examples of potential MPIF-1, MIP-4 and M-CIF antagonists includeantibodies, or in some cases, oligonucleotides, which bind to thepolypeptides. Another example of a potential antagonist is a negativedominant mutant of the polypeptides. Negative dominant mutants arepolypeptides which bind to the receptor of the wild-type polypeptide,but fail to retain biological activity.

[0304] Antisense constructs prepared using antisense technology are alsopotential antagonists. Antisense technology can be used to control geneexpression through triple-helix formation or antisense DNA or RNA, bothof which methods are based on binding of a polynucleotide to DNA or RNA.For example, the 5′ coding portion of the polynucleotide sequence, whichencodes for the mature polypeptides of the present invention, is used todesign an antisense RNA oligonucleotide of from about 10 to 40 basepairs in length. A DNA oligonucleotide is designed to be complementaryto a region of the gene involved in transcription (triple-helix, see Leeet al., Nucl. Acids Res. 6:3073 (1979); Cooney et al, Science 241-456(1988); and Dervan et al., Science 251:1360 (1991)), thereby preventingtranscription and the production of the chemokine polypeptides. Theantisense RNA oligonucleotide hybridizes to the mRNA in vivo and blockstranslation of the mRNA molecule into the polypeptides (antisense—Okano,J. Neurochem. 56:560 (1991); oligodeoxynucleotides as AntisenseInhibitors of Gene Expression, CRC Press, Boca Raton, Fla. (1988)). Theoligonucleotides described above can also be delivered to cells suchthat the antisense RNA or DNA may be expressed in vivo to inhibitproduction of the chemokine polypeptides.

[0305] Another potential chemokine antagonist is a peptide derivative ofthe polypeptides which are naturally or synthetically modified analogsof the polypeptides that have lost biological function yet stillrecognize and bind to the receptors of the polypeptides to therebyeffectively block the receptors. Examples of peptide derivativesinclude, but are not limited to, small peptides or peptide-likemolecules.

[0306] The antagonists may be employed to treat disorders which areeither MPIF-1, MIP-4- and M-CIF -induced or enhanced, for example,auto-immune and chronic inflammatory and infective diseases. Examples ofauto-immune diseases include multiple sclerosis, and insulin-dependentdiabetes.

[0307] The antagonists may also be employed to treat infectious diseasesincluding silicosis, sarcoidosis, idiopathic pulmonary fibrosis bypreventing the recruitment and activation of mononuclear phagocytes.They may also be employed to treat idiopathic hyper-eosinophilicsyndrome by preventing eosinophil production and migration. Endotoxicshock may also be treated by the antagonists by preventing the migrationof macrophages and their production of the chemokine polypeptides of thepresent invention.

[0308] The antagonists may also be employed for treatingatherosclerosis, by preventing monocyte infiltration in the artery wall.

[0309] The antagonists may also be employed to treat histamine mediatedallergic reactions and immunological disorders including late phaseallergic reactions, chronic urticaria, and atopic dermatitis byinhibiting chemokine-induced mast cell and basophil degranulation andrelease of histamine. IgE-mediated allergic reactions such as allergicasthma, rhinitis, and eczema may also be treated.

[0310] The antagonists may also be employed to treat chronic and acuteinflammation by preventing the attraction of monocytes to a wound area.They may also be employed to regulate normal pulmonary macrophagepopulations, since chronic and acute inflammatory pulmonary diseases areassociated with sequestration of mononuclear phagocytes in the lung.

[0311] Antagonists may also be employed to treat rheumatoid arthritis bypreventing the attraction of monocytes into synovial fluid in the jointsof patients. Monocyte influx and activation plays a significant role inthe pathogenesis of both degenerative and inflammatory arthropathies.

[0312] The antagonists may be employed to interfere with the deleteriouscascades attributed primarily to IL-1 and TNF, which prevents thebiosynthesis of other inflammatory cytokines. In this way, theantagonists may be employed to prevent inflammation. The antagonists mayalso be employed to inhibit prostaglandin-independent fever induced bychemokines.

[0313] The antagonists may also be employed to treat cases of bonemarrow failure, for example, aplastic anemia and myelodysplasticsyndrome.

[0314] The antagonists may also be employed to treat asthma and allergyby preventing eosinophil accumulation in the lung. The antagonists mayalso be employed to treat subepithelial basement membrane fibrosis whichis a prominent feature of the asthmatic lung.

[0315] Agonists

[0316] M-CIF, MPIF-1 and/or MIP-4 agonists include any small moleculethat has an activity similar to any one or more of these polypeptides,as described herein. For example, MPIF-1 agonists can be used to enhanceMPIF-1 activity. For example, to enhace MPIF-1 induced myeloprotectionin patients undergoing chemotherapy or bone marrow transplantation. Asanother example, M-CIF agonists can provide one or more ofantiinflammatory activity, anti-TNFα activity, and the like, asdescribed herein for various functional acitivities of M-CIF.

[0317] Disease Diagnosis and Prognosis

[0318] Certain diseases or disorders, as discussed below, may beassociated with enhanced levels of the MPIF-1, M-CIF or MIP-4 proteinand mRNA encoding the MPIF-1, M-CIF or MIP-4 protein when compared to acorresponding “standard” mammal, i.e., a mammal of the same species nothaving the disease or disorder. Further, it is believed that enhancedlevels of the MPIF-1, M-CIF or MIP-4 protein can be detected in certainbody fluids (e.g. sera, plasma, urine, and spinal fluid) from mammalswith a disease or disorder when compared to sera from mammals of thesame species not having the disease or disorder. Thus, the inventionprovides a diagnostic method, which involves assaying the expressionlevel of the gene encoding the MPIF-1, M-CIF or MIP-4 protein inmammalian cells or body fluid and comparing the gene expression levelwith a standard MPIF-1, M-CIF or MIP-4 gene expression level, whereby anincrease in the gene expression level over the standard is indicative ofcertain diseases or disorders.

[0319] Where a disease or disorder diagnosis has already been madeaccording to conventional methods, the present invention is useful as aprognostic indicator, whereby patients exhibiting enhanced MPIF-1, M-CIFor MIP-4 gene expression will experience a worse clinical outcomerelative to patients expressing the gene at a lower level.

[0320] By “assaying the expression level of the gene encoding theMPIF-1, M-CIF or MIP-4 protein” is intended qualitatively orquantitatively measuring or estimating the level of the MPIF-1, M-CIF orMIP-4 protein or the level of the mRNA encoding the MPIF-1, M-CIF orMIP-4 protein in a first biological sample either directly (e.g. bydetermining or estimating absolute protein level or mRNA level) orrelatively (e.g. by comparing to the MPIF-1, M-CIF or MIP-4 proteinlevel or mRNA level in a second biological sample).

[0321] Preferably, the MPIF-1, M-CIF or MIP-4 protein level or mRNAlevel in the first biological sample is measured or estimated andcompared to a standard MPIF-1, M-CIF or MIP-4 protein level or mRNAlevel, the standard being taken from a second biological sample obtainedfrom an individual not having the disease or disorder. As will beappreciated in the art, once a standard MPIF-1, M-CIF or MIP-4 proteinlevel or mRNA level is known, it can be used repeatedly as a standardfor comparison.

[0322] By “biological sample” is intended any biological sample obtainedfrom an individual, cell line, tissue culture, or other source whichcontains MPIF-1, M-CIF or MIP-4 protein or mRNA. Biological samplesinclude mammalian body fluids (such as sera, plasma, urine, synovialfluid and spinal fluid) which contain secreted mature MPIF-1, M-CIF orMIP-4 protein, and ovarian, prostate, heart, placenta, pancreas, acetes,muscle, skin, glandular, kidney, liver, spleen, lung, bone, bone marrow,occular, peripheral nervous, central nervous, breast and umbilicaltissue. Methods for obtaining tissue biopsies and body fluids frommammals are well known in the art. Where the biological sample is toinclude mRNA, a tissue biopsy is the preferred source.

[0323] The present invention is useful for detecting disease in mammals.In particular the invention is useful during useful for diagnosis ortreatment of various immune system-related disorders in mammals,preferably humans. Such disorders include tumors, cancers, and anydisregulation of immune cell function including, but not limited to,autoimmunity, arthritis, leukemias, lymphomas, immunosupression, sepsis,wound healing, acute and chronic infection, cell mediated immunity,humoral immunity, inflammatory bowel disease, myelosupression, and thelike. Preferred mammals include monkeys, apes, cats, dogs, cows, pigs,horses, rabbits and humans. Particularly preferred are humans.

[0324] Total cellular RNA can be isolated from a biological sample usingany suitable technique such as the single-stepguanidinium-thiocyanate-phenol-chloroform method described inChomczynski and Sacchi, Anal. Biochem. 162:156-159 (1987). Levels ofmRNA encoding the MPIF-1, M-CIF or MIP-4 protein are then assayed usingany appropriate method. These include Northern blot analysis, S1nuclease mapping, the polymerase chain reaction (PCR), reversetranscription in combination with the polymerase chain reaction(RT-PCR), and reverse transcription in combination with the ligase chainreaction (RT-LCR).

[0325] Northern blot analysis can be performed as described in Harada etal, Cell 63:303-312 (1990). Briefly, total RNA is prepared from abiological sample as described above. For the Northern blot, the RNA isdenatured in an appropriate buffer (such as glyoxal/dimethylsulfoxide/sodium phosphate buffer), subjected to agarose gelelectrophoresis, and transferred onto a nitrocellulose filter. After theRNAs have been linked to the filter by a UV linker, the filter isprehybridized in a solution containing formamide, SSC, Denhardt'ssolution, denatured salmon sperm, SDS, and sodium phosphate buffer.MPIF-1, M-CIF or MIP-4 protein cDNA labeled according to any appropriatemethod (such as the ³²P-multiprimed DNA labeling system (Amersham)) isused as probe. After hybridization overnight, the filter is washed andexposed to x-ray film. cDNA for use as probe according to the presentinvention is described in the sections above and will preferably atleast 15 bp in length.

[0326] S1 mapping can be performed as described in Fujita et al., Cell49:3357-367 (1987). To prepare probe DNA for use in S1 mapping, thesense strand of above-described cDNA is used as a template to synthesizelabeled antisense DNA. The antisense DNA can then be digested using anappropriate restriction endonuclease to generate further DNA probes of adesired length. Such antisense probes are useful for visualizingprotected bands corresponding to the target mRNA (i.e., mRNA encodingthe MPIF-1, M-CIF or MIP-4 protein). Northern blot analysis can beperformed as described above.

[0327] Preferably, levels of mRNA encoding the MPIF-1, M-CIF or MIP-4protein are assayed using the RT-PCR method described in Makino et al.,Technique 2:295-301 (1990). By this method, the radioactivities of the“amplicons” in the polyacrylamide gel bands are linearly related to theinitial concentration of the target mRNA. Briefly, this method involvesadding total RNA isolated from a biological sample in a reaction mixturecontaining a RT primer and appropriate buffer. After incubating forprimer annealing, the mixture can be supplemented with a RT buffer,dNTPs, DTT, RNase inhibitor and reverse transcriptase. After incubationto achieve reverse transcription of the RNA, the RT products are thensubject to PCR using labeled primers. Alternatively, rather thanlabeling the primers, a labeled dNTP can be included in the PCR reactionmixture. PCR amplification can be performed in a DNA thermal cycleraccording to conventional techniques. After a suitable number of roundsto achieve amplification, the PCR reaction mixture is electrophoresed ona polyacrylamide gel. After drying the gel, the radioactivity of theappropriate bands (corresponding to the mRNA encoding the MPIF-1, M-CIFor MIP-4 protein)) is quantified using an imaging analyzer. RT and PCRreaction ingredients and conditions, reagent and gel concentrations, andlabeling methods are well known in the art. Variations on the RT-PCRmethod will be apparent to the skilled artisan.

[0328] Any set of oligonucleotide primers which will amplify reversetranscribed target mRNA can be used and can be designed as described inthe sections above.

[0329] Assaying MPIF-1, M-CIF or MIP-4 protein levels in a biologicalsample can occur using any art-known method. Preferred for assayingMPIF-1, M-CIF or MIP-4 protein levels in a biological sample areantibody-based techniques. For example, MPIF-1, M-CIF or MIP-4 proteinexpression in tissues can be studied with classical immunohistologicalmethods. In these, the specific recognition is provided by the primaryantibody (polyclonal or monoclonal) but the secondary detection systemcan utilize fluorescent, enzyme, or other conjugated secondaryantibodies. As a result, an immunohistological staining of tissuesection for pathological examination is obtained. Tissues can also beextracted, e.g. with urea and neutral detergent, for the liberation ofMPIF-1, M-CIF or MIP-4 protein for Western-blot or dot/slot assay(Jalkanen, M., et al., J. Cell. Biol. 101:976-985 (1985); Jalkanen, M.,et al., J. Cell. Biol. 105:3087-3096 (1987)). In this technique, whichis based on the use of cationic solid phases, quantitation of MPIF-1,M-CIF or MIP-4 protein can be accomplished using isolated MPIF-1, M-CIFor MIP-4 protein as a standard. This technique can also be applied tobody fluids. With these samples, a molar concentration of MPIF-1, M-CIFor MIP-4 protein will aid to set standard values of MPIF-1, M-CIF orMIP-4 protein content for different body fluids, like serum, plasma,urine, spinal fluid, etc. The normal appearance of MPIF-1, M-CIF orMIP-4 protein amounts can then be set using values from healthyindividuals, which can be compared to those obtained from a testsubject.

[0330] Other antibody-based methods useful for detecting MPIF-1, M-CIFor MIP-4 protein gene expression include immunoassays, such as theenzyme linked immunosorbent assay (ELISA) and the radioimmunoassay(RIA). For example, an MPIF-1, M-CIF or MIP-4 protein-specificmonoclonal antibodies can be used both as an immunoabsorbent and as anenzyme-labeled probe to detect and quantify the MPIF-1, M-CIF or MIP-4protein. The amount of MPIF-1, M-CIF or MIP-4 protein present in thesample can be calculated by reference to the amount present in astandard preparation using a linear regression computer algorithm. Inanother ELISA assay, two distinct specific monoclonal antibodies can beused to detect MPIF-1, M-CIF or MIP-4 protein in a body fluid. In thisassay, one of the antibodies is used as the immunoabsorbent and theother as the enzyme-labeled probe.

[0331] The above techniques may be conducted essentially as a “one-step”or “two-step” assay. The “one-step” assay involves contacting MPIF-1,M-CIF or MIP-4 protein with immobilized antibody and, without washing,contacting the mixture with the labeled antibody. The “two-step” assayinvolves washing before contacting the mixture with the labeledantibody. Other conventional methods may also be employed as suitable.It is usually desirable to immobilize one component of the assay systemon a support, thereby allowing other components of the system to bebrought into contact with the component and readily removed from thesample.

[0332] Suitable enzyme labels include, for example, those from theoxidase group, which catalyze the production of hydrogen peroxide byreacting with substrate. Glucose oxidase is particularly preferred as ithas good stability and its substrate (glucose) is readily available.Activity of an oxidase label may be assayed by measuring theconcentration of hydrogen peroxide formed by the enzyme-labelledantibody/substrate reaction. Besides enzymes, other suitable labelsinclude radioisotopes, such as iodine (¹²⁵I, ¹²¹I), carbon (¹⁴C),sulphur (35S), tritium (³H), indium (¹¹²In), and technetium (^(99m)Tc),and fluorescent labels, such as fluorescein and rhodamine, and biotin.

[0333] The polypeptides of the present invention, and polynucleotidesencoding such polypeptides, may be employed as research reagents for invitro purposes related to scientific research, synthesis of DNA andmanufacture of DNA vectors, and for the purpose of developingtherapeutics and diagnostics for the treatment of human disease. Forexample, M-CIF and MPIF-1 may be employed for the expansion of immaturehematopoietic progenitor cells, for example, granulocytes, macrophagesor monocytes, by temporarily preventing their differentiation. Thesebone marrow cells may be cultured in vitro.

[0334] Fragments of the full length MPIF-1, MIP-4 or M-CIF genes may beused as a hybridization probe for a cDNA library to isolate the fulllength gene and to isolate other genes which have a high sequencesimilarity-to the gene or similar biological activity. Preferably,however, the probes have at least 30 bases and may contain, for example,50 or more bases. The probe may also be used to identify a cDNA clonecorresponding to a full length transcript and a genomic clone or clonesthat contain the complete genes including regulatory and promotorregions, exons, and introns. An example of a screen comprises isolatingthe coding region of the genes by using the known DNA sequence tosynthesize an oligonucleotide probe. Labeled oligonucleotides having asequence complementary to that of the genes of the present invention areused to screen a library of human cDNA, genomic DNA or mRNA to determinewhich members of the library the probe hybridizes to.

[0335] This invention is also related to the use of the MPIF-1, MIP-4and M-CIF gene as part of a diagnostic assay for detecting diseases orsusceptibility to diseases related to the presence of mutations in thenucleic acid sequences. Such diseases are related to under-expression ofthe chemokine polypeptides.

[0336] Individuals carrying mutations in the MPIF-1, MIP-4 and M-CIF maybe detected at the DNA level by a variety of techniques. Nucleic acidsfor diagnosis may be obtained from a patient's cells, such as fromblood, urine, saliva, tissue biopsy and autopsy material. The genomicDNA may be used directly for detection or may be amplified enzymaticallyby using PCR (Saiki et al., Nature 324:163-166 (1986) ) prior toanalysis. RNA or CDNA may also be used for the same purpose. As anexample, PCR primers complementary to the nucleic acid encoding MPIF-1,MIP-4 and M-CIF can be used to identify and analyze MPIF-1, MIP-4 andM-CIF mutations. For example, deletions and insertions can be detectedby a change in size of the amplified product in comparison to the normalgenotype. Point mutations can be identified by hybridizing amplified DNAto radiolabeled MPIF-1, MIP-4 and M-CIF RNA or alternatively,radiolabeled MPIF-1, MIP-4 and M-CIF antisense DNA sequences. Perfectlymatched sequences can be distinguished from mismatched duplexes by RNaseA digestion or by differences in melting temperatures.

[0337] Genetic testing based on DNA sequence differences may be achievedby detection of alteration in electrophoretic mobility of DNA fragmentsin gels with or without denaturing agents. Small sequence deletions andinsertions can be visualized by high resolution gel electrophoresis. DNAfragments of different sequences may be distinguished on denaturingformamide gradient gels in which the mobilities of different DNAfragments are retarded in the gel at -different positions according totheir specific melting or partial melting temperatures (see, e.g. Myerset al., Science 230:1242 (1985)).

[0338] Sequence changes at specific locations may also be revealed bynuclease protection assays, such as RNase and S1 protection or thechemical cleavage method (e.g. Cotton et al., PNAS, USA 85:4397-4401(1985)).

[0339] Thus, the detection of a specific DNA sequence may be achieved bymethods such as hybridization, RNase protection, chemical cleavage,direct DNA sequencing or the use of restriction enzymes, (e.g.Restriction Fragment Length Polymorphisms (RFLP)) and Southern blottingof genomic DNA.

[0340] In addition to more conventional gel-electrophoresis and DNAsequencing, mutations can also be detected by in situ analysis.

[0341] The present invention also relates to a diagnostic assay fordetecting altered levels of MPIF-1, MIP-4 and M-CIF protein in varioustissues since an over-expression of the proteins compared to normalcontrol tissue samples may detect the presence of a disease orsusceptibility to a disease, for example, a tumor. Assays used to detectlevels of MPIF-1, MIP-4 and M-CIF protein in a sample derived from ahost are well-known to those of skill in the art and includeradioimmunoassays, competitive-binding assays, Western Blot analysis,ELISA assays and “sandwich” assay. An ELISA assay (Coligan, et al.,Current Protocols in Immunology 1(2), Chapter 6, (1991)) initiallycomprises preparing an antibody specific to the MPIF-1 MIP-4 and M-CIFantigens, preferably a monoclonal antibody. In addition a reporterantibody is prepared against the monoclonal antibody. To the reporterantibody is attached a detectable reagent such as radioactivity,fluorescence or, in this example, a horseradish peroxidase enzyme. Asample is removed from a host and incubated on a solid support, e.g. apolystyrene dish, that binds the proteins in the sample. Any freeprotein binding sites on the dish are then covered by incubating with anon-specific protein like BSA. Next, the monoclonal antibody isincubated in the dish during which time the monoclonal antibodies attachto any MPIF-1, MIP-4 and M-CIF proteins attached to the polystyrenedish. All unbound monoclonal antibody is washed out with buffer. Thereporter antibody linked to horseradish peroxidase is now placed in thedish resulting in binding of the reporter antibody to any monoclonalantibody bound to MPIF-1, MIP-4 and M-CIF. Unattached reporter antibodyis then washed out. Peroxidase substrates are then added to the dish andthe amount of color developed in a given time period is a measurement ofthe amount of MPIF-1, MIP-4 and M-CIF protein present in a given volumeof patient sample when compared against a standard curve.

[0342] A competition assay may be employed wherein antibodies specificto MPIF-1, MIP-4 and M-CIF are attached to a solid support and labeledMPIF-1, MIP-4 and M-CIF and a sample derived from the host are passedover the solid support and the amount of label detected, for example byliquid scintillation chromatography, can be correlated to a quantity ofprotein in the sample.

[0343] A “sandwich” assay is similar to an ELISA assay. In a “sandwich”assay MPIF-1, MIP-4 and M-CIF is passed over a solid support and bindsto antibody attached to a solid support. A second antibody is then boundto the MPIF-1, MIP-4 and M-CIF. A third antibody which is labeled andspecific to the second antibody is then passed over the solid supportand binds to the second antibody and an amount can then be quantified.

[0344] This invention provides a method for identification of thereceptors for the chemokine polypeptides. The gene encoding the receptorcan be identified by numerous methods known to those of skill in theart, for example, ligand panning and FACS sorting (Coligan, et al.,Current Protocols in Immun. 1(2), Chapter 5, (1991)). Preferably,expression cloning is employed wherein polyadenylated RNA is preparedfrom a cell responsive to the polypeptides, and a cDNA library createdfrom this RNA is divided into pools and used to transfect COS cells orother cells that are not responsive to the polypeptides. Transfectedcells which are grown on glass slides are exposed to the labeledpolypeptides. The polypeptides can be labeled by a variety of meansincluding iodination or inclusion of a recognition site for asite-specific protein kinase. Following fixation and incubation, theslides are subjected to autoradiographic analysis. Positive pools areidentified and sub-pools are prepared and retransfected using aniterative sub-pooling and rescreening process, eventually yielding asingle clones that encodes the putative receptor.

[0345] As an alternative approach for receptor identification, thelabeled polypeptides can be photoaffinity linked with cell membrane orextract preparations that express the receptor molecule. Cross-linkedmaterial is resolved by PAGE analysis and exposed to X-ray film. Thelabeled complex containing the receptors of the polypeptides can beexcised, resolved into peptide fragments, and subjected to proteinmicrosequencing. The amino acid sequence obtained from microsequencingwould be used to design a set of degenerate oligonucleotide probes toscreen a cDNA library to identify the genes encoding the putativereceptors.

[0346] Therapeutics

[0347] Polypeptides of the present invention can be used in a variety ofimmunoregulatory and inflammatory functions and also in a number ofdisease conditions. MPIF-1, MIP-4 and M-CIF are in the chemokine familyand therefore they are a chemo-attractant for leukocytes (such asmonocytes, neutrophils, T lymphocytes, eosinophils, basophils, etc.).

[0348] Northern Blot analyses show that MPIF-1, MIP-4 and M-CIF areexpressed predominantly is tissues of haemopoietic origin.

[0349] MPIF-1 Therapeutic/Diagnostic Applications

[0350] MPIF-1 is shown to play an important role in the regulation ofthe immune response and inflammation. In FIG. 19, it is shown thatlipopolysaccharide induces the expression of MPIF-1 from humanmonocytes. Accordingly, in response to the presence of an endotoxin,MPIF-1 is expressed from monocytes and, therefore, administration ofMPIF-1 may be employed to regulate the immune response of a host. MPIF-1could be used as an anti-inflammatory agent.

[0351] As illustrated in FIG. 10, the chemoattractant activity of MPIF-1on THP-1 cells (A) and PBMCs (B) is significant. MPIF-l also inducessignificant calcium mobilization in THP-1 cells (FIG. 11) showing thatMPIF-1 has a biological effect on monocytes. Further, MPIF-1 produces adose dependent chemotactic and calcium mobilization response in humanmonocytes.

[0352] Further, the polypeptides of the present invention can be usefulin anti-tumor therapy since there is evidence that chemokine expressingcells injected into tumors have caused regression of the tumor, forexample, in the treatment of Karposi sarcoma. MPIF-1 may induce cells tosecrete TNF-α, which is a known agent for regressing tumors, in whichcase this protein could be used to induce tumor regression. MPIF-1 mayalso induce human monocytes to secrete other tumor and cancer inhibitingagents such as IL-6, IL-1 and G-CSF. Also, MPIF-1, MIP-4 and M-CIFstimulate the invasion and activation of host defense (tumoricidal)cells, e.g. cytotoxic T-cells and macrophages via their chemotacticactivity, and in this way can also be used to treat solid tumors.

[0353] The polypeptides can also be employed to inhibit theproliferation and differentiation of hematopoietic cells and thereforemay be employed to protect bone marrow stem cells from chemotherapeuticagents during chemotherapy. FIGS. 12 and 13 illustrate that MPIF-1inhibit colony formation by low proliferative potential colony formingcells (LPP-CFC). FIG. 14 illustrates that M-CIF specifically inhibitsM-CSF-stimulated colony formation, while MPIF-1 does not. Since, bothMPIF-1 and M-CIF significantly inhibit growth and/or differentiation ofbone marrow cells, this antiproliferative effect may allow adminstrationof higher doses of chemotherapeutic agents and, therefore, moreeffective chemotherapeutic treatment.

[0354] The inhibitory effect of the M-CIF and MPIF-1 polypeptides on thesubpopulation of committed progenitor cells, (for example granulocyte,and macrophage/monocyte cells) may be employed therapeutically toinhibit proliferation of leukemic cells.

[0355] In FIGS. 15, 16 and 17 the committed cells of the cell lineagesutilized were removed and the resulting population of cells werecontacted with M-CIF and MPIF-1 causes a decrease in the Mac-1 positivepopulation of cells by nearly 50%, which is consistent with the resultsof FIG. 14 which shows M-CIF induces inhibition of M-CSF responsivecolony-forming cells. MPIF-1, as shown in FIG. 17, inhibits the abilityof committed progenitor cells to form colonies in response to IL-3,GM-CSF and M-CSF. Further, as shown in FIG. 18, a dose response ofMPIF-1 is shown to inhibit colony formation. This inhibition could bedue to a specific blockage of the differentiative signal mediated bythese factors or to a cytotoxic effect on the progenitor cells. Inaddition, Examples 15 and 16 demonstrate that MPIF-1 has in vitro and invivo myeloprotection from cytotoxicity of chemotherapeutic drugs. Thus,MPIF-1 can be useful as a myeloprotectant for patients undergoingchemotherapy.

[0356] Since the MPIF-1 protein suppresses myeloid cell growth, theinvention provides methods for myeloprotection by suppressing myeloidcell proliferation in an individual, which involve administering amyelosuppressive amount of MPIF-1 either alone or together with one ormore chemokines selected from the group consisting of MacrophageInflammatory Protein-1α (MIP-1α), Macrophage Inflammatory Protein-2α(MIP-2α), Platelet Factor 4 (PF4), Interleukin-8 (IL-8), MacrophageChemotactic and Activating Factor (MCAF), and Macrophage InflammatoryProtein-Related Protein-2 (MRP-2). The myelosuppressive compositions ofthe present invention thus provide myeloprotective effects and areuseful in conjunction with therapies that have an adverse affect onmyeloid cells. This is because the myelosuppressive compositions of thepresent invention place myeloid cells in a slow-cycling state therebyproviding protection against cell damage caused by, for example,radiation therapy or chemotherapy using cell-cycle active drugs, such ascytosine arabinoside, hydroxyurea, 5-Fu and Ara-C. Once thechemotherapeutic drug has cleared the patients system, it would bedesirable to stimulate rapid amplifiation and differentiation of stemcells that were protected by MPIF-1 using, for example,myelostimulators, such as GMCSF, GCSF, EPo, and thrombopoeitin.

[0357] The myelosuppressive pharmaceutical compositions of the presentinvention are also useful in the treatment of leukemia, which causes ahyperproliferative myeloid cell state. Thus, the invention furtherprovides methods for treating leukemia, which involve administering to aleukemia patient a myelosuppressive amount of MPIF-1 either alone ortogether with one or more chemokines selected from the group consistingof MIP-1α, MIP-2α, PF4, IL-8, MCAF, and MRP-2.

[0358] By “suppressing myeloid cell proliferation” is intendeddecreasing the cell proliferation of myeloid cells and/or increasing thepercentage of myeloid cells in the slow-cycling phase. As above, by“individual” is intended mammalian individuals, preferably humans.Preincubation of the myelosuppressive compositions of the presentinvention with acetonitrile (ACN) significantly enhances the specificactivity of these chemokines for suppression of myeloid progenitorcells. Thus, preferably, prior to administration, the myelosuppresivecompositions of the present invention are pretreated with ACN asdescribed in Broxmeyer H. E., et al., Ann-Hematol. 71(5):235-46(1995)and PCT Publication WO 94/13321, the entire disclosures of which arehereby incorporated herein by reference.

[0359] The myelosuppressive compositions of the present invention may beused in combination with a variety of chemotherapeutic agents includingalkylating agents such as nitrogen mustards, ethylenimines,methylmelamines, alkyl sulfonates, nitrosuoureas, and triazenes;antimetabolites such as folic acid analogs, pyrimidine analogs, inparticular fluorouracil and cytosine arabinoside, and purine analogs;natural products such as vinca alkaloids, epipodophyllotoxins,antibiotics, enzymes and biological response modifiers; andmiscellaneous products such as platinum coordination complexes,anthracenedione, substituted urea such as hydroxyurea, methyl hydrazinederivatives, and adrenocorticoid suppressant.

[0360] Chemotherapeutic agents can be administered at knownconcentrations according to known techniques. The myelosuppressivecompositions of the present invention can be co-administered with achemotherapeutic agent, or administered separately, either before orafter chemotherapeutic administration.

[0361] Certain chemokines, such as MIP-1β, MIP-2β and GRO-α, inhibit (atleast partially block) the myeloid suppressive affects of themyelosuppresive compositions of the present invention. Thus, in afurther embodiment, the invention provides methods for inhibitingmyelosuppression, which involves administering an effective amount of amyelosuppressive inhibitor selected from the group consisting of MIP-1β,MIP-2β and GRO-α to a mammal previously exposed to the myelosuppresiveagent MPIF-1 either alone or together with one or more of MIP-1α,MIP-2α, PF4, IL-8, MCAF, and MRP-2.

[0362] One of ordinary skill will appreciate that effective amounts ofthe MPIF-1 polypeptides for treating an individual in need of anincreased level of MPIF-1 activity (including amounts of MPIF-1polypeptides effective for myelosuppression with or withoutmyelosuppressive agents or myelosuppressive inhibitors) can bedetermined empirically for each condition where administration of MPIF-1is indicated. The polypeptide having MPIF-1 activity my be administeredin pharmaceutical compositions in combination with one or morepharmaceutically acceptable excipients.

[0363] MPIF-1 may also be employed to treat leukemia and abnormallyproliferating cells, for example tumor cells, by inducing apoptosis.MPIF-1 induces apoptosis in a population of hematopoietic progenitorcells.

[0364] MPIF-1 may be employed for the expansion of immaturehematopoietic progenitor cells, for example, granulocytes, macrophagesor monocytes, by temporarily preventing their differentiation. Thesebone marrow cells may be cultured in vitro. Thus, MPIF-1 can also beuseful as a modulator of hematopoietic stem cells in vitro for thepurpose of bone marrow transplantation and/or gene therapy. Since stemcells are rare and are most useful for introducing genes into for genetherapy, MPIF can be used to isolate enriched populations of stem cells.Stem cells can be enriched by culturing cells in the presence ofcytotoxins, such as 5-Fu, which kills rapidly dividing cells, where asthe stem cells will be protected by MPIF-1. These stem cells can bereturned to a bone marrow transplant patient or can then be used fortransfection of the desired gene for gene therapy. In addition, MPIF-1can be injected into animals which results in the release of stem cellsfrom the bone marrow of the animal into the periferal blood. These stemcells can be isolated for the purpose of autologous bone marrowtransplantation or manipulation for gene therapy. After the patient hasfinished chemotherapy or radiation treatment, the isolated stem cellscan be returned to the patient.

[0365] In addition, since MPIF-1 has effects on T-lymphocytes as well asmacrophages, MPIF-1 may enhace the capacity of antigen presenting cells(APCs) to take up virus, bacteria or other foreign substances, processthem and present them to the lymphocytes responsible for immuneresponses. MPIF-1 may also modulate the interaction of APCs withT-lymphocytes and B-lymphocytes. MPIF-1 may provide a costimulatorysignal during antigen presentation which directs the responding cell tosurvive, proliferate, differentiate, secrete additional cytokines orsoluble mediators, or selectively removes the responding cell byinducing apoptosis or other mechanisms of cell death. Since APCs havebeen shown to facilitate the transfer of HIV to CD4+T-lymphocytes,MPIF-1 may also influence this ability and prevent infection oflymphocytes by HIV or other viruses mediated through APCs. This is alsotrue for the intital infection of APCs, T-lymphocytes or other celltypes by HIV, EBV, or any other such viruses.

[0366] In addition, recent demonstration that the MIP-1a receptor servesas a cofactor in facilitating the entry of HIV into human monocytes andT-lymphocytes raises an interesting possibility that MPIF-1 or itsvariants might interfere with the process of HIV entry into the cells.(See, Example 17). Thus, MPIF-1 can be useful as an antiviral agent forviruses and retroviruses whose entry is facilitated by the MIP-1 areceptor.

[0367] MPIF-1 may act as an immune enhancement factor by stimulating theintrinsic activity of T-lymphocytes to fight bacterial and viralinfection as well as other foreign bodies. Such activities are usefulfor the normal response to foreign antigens such as infection ofallergies as well as immunoresponses to neoplastic or benign growthincluding both solid tumors and leukemias.

[0368] For these reasons the present invention is useful for diagnosisor treatment of various immune system-related disorders in mammals,preferably humans. Such disorders include tumors, cancers, and anydisregulation of immune cell function including, but not limited to,autoimmunity, arthritis, leukemias, lymphomas, immunosupression, sepsis,wound healing, acute and chronic infection, cell mediated immunity,humoral immunity, inflammatory bowel disease, myelosupression, and thelike.

[0369] M-CIF Therapeutic/Diagnostic Applications

[0370] M-CIF activity is useful for immune enhancement or suppression,myeloprotection, stem cell mobilization, acute and chronic inflammatorycontrol and treatment of leukemia. In addition, since M-CIF has effectson T-lymphocytes as well as macrophages, M-CIF enhances the capacity ofantigen presenting cells (APCs) to take up virus, bacteria or otherforeign substances, process them and present them to the lymphocytesresponsible for immune responses. In addition, M-CIF also modulates theinteraction of APCs with T-lymphocytes and B-lymphocytes. For instance,M-CIF provides a costimulation signal during antigen presentation whichdirects the responding cell to survive, proliferate, differentiate,secrete additional cytokines or soluble mediators, or selectivelyremoves the responding cell by inducing apoptosis or other mechanisms ofcell death. Since APCs have been shown to facilitate the transfer of HIVto CD4+T-lymphocytes M-CIF also influences this ability and preventsinfection of lymphocytes by HIV or other viruses mediated through APCs.This is also true for the initial infection of APCs, T-lymphocytes orother cell types by HIV, EBV, or any other such viruses.

[0371] In addition, since M-CIF directly effects T-lymphocytes in vivo,M-CIF acts as an immune enhancement factor by stimulating the intrinsicactivity of T-lymphocytes to fight bacterial and viral infection as wellas other foreign bodies. Such activities are useful for the normalresponse to foreign antigens such as infection of allergies as well asimmunoresponses to neoplastic or benign growth including both solidtumors and leukemias.

[0372] For these reasons the present invention is useful for diagnosisor treatment of various immune system-related disorders in mammals,preferably humans. Such disorders include tumors, cancers, and anydisregulation of immune cell function including, but not limited to,autoimmunity, arthritis, asthma, leukemias, lymphomas,immunosuppression, sepsis, wound healing, acute and chronic infection,cell mediated immunity, humoral immunity, inflammatory bowel disease,myelosuppression, and the like.

[0373] M-CIF, as an antiinflammatory, can treat such disorders as, butnot limited to, those involving abnormal production of TNFα. Suchdisorders include, but are not limited to, sepsis syndrome, includingcachexia, circulatory collapse and shock resulting from acute or chronicbacterial infection, acute and chronic parasitic or infectiousprocesses, including bacterial, viral and fungal infections, acute andchronic immune and autoimmune pathologies, such as systemic lupuserythematosus and rheumatoid arthritis, alcohol-induced hepatitis,chronic inflammatory pathologies such as sarcoidosis and Crohn'spathology, vascular inflammatory pathologies such as disseminatedintravascular coagulation, graft-versus-host pathology, Kawasaki'spathology; malignant pathologies involving TNF-secreting tumors andneurodegenerative diseases.

[0374] Neurodegenerative diseases include, but are not limited to, AIDSdementia complex, demyelinating diseases, such as multiple sclerosis andacute transverse myelitis; extrapyramidal and cerebellar disorders suchas lesions of the corticospinal system; disorders of the basal gangliaor cerebellar disorders; hyperkinetic movement disorders such asHuntington's Chorea and senile chorea; drug-induced movement disorders,such as those induced by drugs which block CNS dopamine receptors;hypokinetic movement disorders, such as Parkinson's disease; Progressivesupra-nucleo Palsy; structural lesions of the cerebellum;spinocerebellar degenerations, such as spinal ataxia, Friedreich'sataxia, cerebellar cortical degenerations, multiple systemsdegenerations (Mencel, Dejerine-Thomas, Shi-Drager, and Machado-Joseph);systemic disorders (Refsum's disease, abetalipoprotemia, ataxia,telangiectasia, and mitochondrial multi.system disorder); demyelinatingcore disorders, such as multiple sclerosis, acute transverse myelitis;and disorders of the motor unit such as neurogenic muscular atrophies(anterior horn cell degeneration, such as amyotrophic lateral sclerosis,infantile spinal muscular atrophy and juvenile spinal muscular atrophy);Alzheimer's disease; Down's Syndrome in middle age; Diffuse Lewy bodydisease; Senile Dementia of Lewy body type; Wernicke-Korsakoff syndrome;chronic alcoholism; Creutzfeldt-Jakob disease; Subacute sclerosingpanencephalitis Hallerrorden-Spatz disease; and Dementia pugilistica.One preferred neurodegenerative disease is multiple sclerosis.

[0375] See, e.g., Berkow et al, eds., The Merck Manual, 16th edition,Merck and Co., Rahway, N.J., 1992, which reference, and references citedtherein, are entirely incorporated herein by reference.

[0376] Accordingly, MPIF-1, MIP-4 and M-CIF can be used to facilitatewound healing by controlling infiltration of target immune cells to thewound area. In a similar fashion, the polypeptides of the presentinvention can enhance host defenses against chronic infections, e.g.mycobacterial, via the attraction and activation of microbicidalleukocytes.

[0377] The polypeptides of the present invention, and polynucleotidesencoding such polypeptides, may be employed as research reagents for invitro purposes related to scientific research, synthesis of DNA andmanufacture of DNA vectors, and for the purpose of developingtherapeutics and diagnostics for the treatment of human disease. Forexample, M-CIF and MPIF-1 may be employed for the expansion of immaturehematopoietic progenitor cells, for example, granulocytes, macrophagesor monocytes, by temporarily preventing their differentiation. Thesebone marrow cells may be cultured in vitro.

[0378] Another use of the polypeptides is the inhibition of T-cellproliferation via inhibition of IL-2 biosynthesis, for example, inauto-immune diseases and lymphocytic leukemia.

[0379] MPIF-1, MIP-4 and M-CIF can also be useful for inhibitingepidermal keratinocyte proliferation which has utility in psoriasis(keratinocyte hyper-proliferation) since Langerhans cells in skin havebeen found to produce MIP-1α.

[0380] MPIF-1, MIP-4 and M-CIF can be used to prevent prevent scarringduring wound healing both via the recruitment of debris-cleaning andconnective tissue-promoting inflammatory cells and by its control ofexcessive TGFβ-mediated fibrosis, in addition these polypeptides can beused to treat stroke, thrombocytosis, pulmonary emboli andmyeloproliferative disorders, since MPIF-1, MIP-4 and M-CIF increasevascular permeability.

[0381] Pharmaceutical Compositions

[0382] The MPIF-1, M-CIF or MIP-4 polypeptide pharmaceutical compositioncomprises an effective amount of an isolated MPIF-1, M-CIF or MIP-4polypeptide of the invention, particularly a mature form of the MPIF-1,M-CIF or MIP-4, effective to increase the MPIF-1, M-CIF or MIP-4activity level in such an individual. Such compositions can beformulated and dosed in a fashion consistent with good medical practice,taking into account the clinical condition of the individual patient(especially the side effects of treatment with MPIF-1, M-CIF or MIP-4polypeptide alone), the site of delivery of the MPIF-1, M-CIF or MIP-4polypeptide composition, the method of administration, the scheduling ofadministration, and other factors known to practitioners. The “effectiveamount” of MPIF-1, M-CIF or MIP-4 polypeptide for purposes herein isthus determined by such considerations.

[0383] Polypeptides, antagonists or agonists of the present inventioncan be employed in combination with a suitable pharmaceutical carrier.Such compositions comprise a therapeutically effective amount of theprotein, and a pharmaceutically acceptable carrier or excipient. Such acarrier includes but is not limited to saline, buffered saline,dextrose, water, glycerol, ethanol, and combinations thereof. Theformulation should suit the mode of administration.

[0384] By “pharmaceutically acceptable carrier” is meant a non-toxicsolid, semisolid or liquid filler, diluent, encapsulating material orformulation auxiliary of any type. The term “parenteral” as used hereinrefers to modes of administration which include intravenous,intramuscular, intraperitoneal, intrasternal, subcutaneous andintraarticular injection and infusion.

[0385] The MPIF-1, M-CIF or MIP-4 polypeptide is also suitablyadministered by sustained-release systems. Suitable examples ofsustained-release compositions include semi-permeable polymer matricesin the form of shaped articles, e.g. films, or mirocapsules.Sustained-release matrices include polylactides (U.S. Pat. No.3,773,919, EP 58,481), copolymers of L-glutamic acid andgamma-ethyl-L-glutamate (Sidman, U. et al., Biopolymers 22:547-556(1983)), poly (2-hydroxyethyl methacrylate) (R. Langer et al., J.Biomed. Mater. Res. 15:167-277 (1981), and R. Langer, Chem. Tech.12:98-105 (1982)), ethylene vinyl acetate (R. Langer et al., Id.) orpoly-D-(−)-3-hydroxybutyric acid (EP 133,988). Sustained-release MPIF-1,M-CIF or MIP-4 polypeptide compositions also include liposomallyentrapped MPIF-1, M-CIF or MIP-4 polypeptide. Liposomes containingMPIF-1, M-CIF or MIP-4 polypeptide are prepared by methods known per se:DE 3,218,121; Epstein et al., Proc. Natl. Acad. Sci. (USA) 82:3688-3692(1985); Hwang et al., Proc. Natl. Acad. Sci. (USA) 77:4030-4034 (1980);EP 52,322; EP 36,676; EP 88,046; EP 143,949; EP 142,641; Japanese Pat.Appl. 83-118008; U.S. Pat. Nos. 4,485,045 and 4,544,545; and EP 102,324.Ordinarily, the liposomes are of the small (about 200-800 Angstroms)unilamellar type in which the lipid content is greater than about 30mol. percent cholesterol, the selected proportion being adjusted for theoptimal MPIF-1, M-CIF or MIP-4 polypeptide therapy.

[0386] For parenteral administration, in one embodiment, the MPIF-1,M-CIF or MIP-4 polypeptide is formulated generally by mixing it at thedesired degree of purity, in a unit dosage injectable form (solution,suspension, or emulsion), with a pharmaceutically acceptable carrier,i.e., one that is non-toxic to recipients at the dosages andconcentrations employed and is compatible with other ingredients of theformulation. For example, the formulation preferably does not includeoxidizing agents and other compounds that are known to be deleterious topolypeptides.

[0387] Generally, the formulations are prepared by contacting theMPIF-1, M-CIF or MIP-4 polypeptide uniformly and intimately with liquidcarriers or finely divided solid carriers or both. Then, if necessary,the product is shaped into the desired formulation. Preferably thecarrier is a parenteral carrier, more preferably a solution that isisotonic with the blood of the recipient. Examples of such carriervehicles include water, saline, Ringer's solution, and dextrosesolution. Non-aqueous vehicles such as fixed oils and ethyl oleate arealso useful herein, as well as liposomes.

[0388] The carrier suitably contains minor amounts of additives such assubstances that enhance isotonicity and chemical stability. Suchmaterials are non-toxic to recipients at the dosages and concentrationsemployed, and include buffers such as phosphate, citrate, succinate,acetic acid, and other organic acids or their salts; antioxidants suchas ascorbic acid; low molecular weight (less than about ten residues)polypeptides, e.g. polyarginine or tripeptides; proteins, such as serumalbumin, gelatin, or immunoglobulins; hydrophilic polymers such aspolyvinylpyrrolidone; amino acids, such as glycine, glutamic acid,aspartic acid, or arginine; monosaccharides, disaccharides, and othercarbohydrates including cellulose or its derivatives, glucose, manose,or dextrins; chelating agents such as EDTA; sugar alcohols such asmannitol or sorbitol; counterions such as sodium; and/or nonionicsurfactants such as polysorbates, poloxamers, or PEG.

[0389] The MPIF-1, M-CIF or MIP-4 polypeptide is typically formulated insuch vehicles at a concentration of about 0.1 mg/ml to 100 mg/ml,preferably 1 -10 mg/ml, at a pH of about 3 to 8. It will be understoodthat the use of certain of the foregoing excipients, carriers, orstabilizers will result in the formation of MPIF-1, M-CIF or MIP-4polypeptide salts.

[0390] MPIF-1, M-CIF or MIP-4 polypeptide to be used for therapeuticadministration must be sterile. Sterility is readily accomplished byfiltration through sterile filtration membranes (e.g. 0.2 micronmembranes). Therapeutic MPIF-1, M-CIF or MIP-4 polypeptide compositionsgenerally are placed into a container having a sterile access port, forexample, an intravenous solution bag or vial having a stopper pierceableby a hypodermic injection needle.

[0391] MPIF-1, M-CIF or MIP-4 polypeptide ordinarily will be stored inunit or multi-dose containers, for example, sealed ampoules or vials, asan aqueous solution or as a lyophilized formulation for reconstitution.As an example of a lyophilized formulation, 10-ml vials are filled with5 ml of sterile-filtered 1% (w/v) aqueous MPIF-1, M-CIF or MIP-4polypeptide solution, and the resulting mixture is lyophilized. Theinfusion solution is prepared by reconstituting the lyophilized MPIF-1,M-CIF or MIP-4 polypeptide using bacteriostatic Water-for-Injection.

[0392] The invention also provides a pharmaceutical pack or kitcomprising one or more containers filled with one or more of theingredients of the pharmaceutical compositions of the invention.Associated with such container(s) can be a notice in the form prescribedby a governmental agency regulating the manufacture, use or sale ofpharmaceuticals or biological products, which notice reflects approvalby the agency of manufacture, use or sale for human administration. Inaddition, the polypeptides of the present invention may be employed inconjunction with other therapeutic compounds.

[0393] Modes of administration

[0394] It will be appreciated that conditions caused by a decrease inthe standard or normal level of MPIF-1, M-CIF or MIP-4 activity in anindividual, can be treated by administration of MPIF-1, M-CIF or MIP-4protein. Thus, the invention further provides a method of treating anindividual in need of an increased level of MPIF-1, M-CIF or MIP-4activity comprising administering to such an individual a pharmaceuticalcomposition comprising an effective amount of an isolated MPIF-1, M-CIFor MIP-4 polypeptide of the invention, particularly a mature form of theMPIF-1, M-CIF or MIP-4, effective to increase the MPIF-1, M-CIF or MIP-4activity level in such an individual.

[0395] The amounts and dosage regimens of MPIF-1, MIP-4 and M-CIFadministered to a subject will depend on a number of factors such as themode of administration, the nature of the condition being treated andthe judgment of the prescribing physician. The pharmaceuticalcompositions are administered in an amount which is effective fortreating and/or prophylaxis of the specific indication. In general, thepolypeptides will be administered in an amount of at least about 10μg/kg body weight and in most cases they will be administered in anamount not in excess of about 10 mg/kg body weight per day andpreferably the dosage is from about 10 μg/kg body weight daily, takinginto account the routes of administration, symptoms, etc.

[0396] As a general proposition, the total pharmaceutically effectiveamount of MPIF-1, M-CIF or MIP-4 polypeptide administered parenterallyper dose will more preferably be in the range of about 1 μg/kg/day to 10mg/kg/day of patient body weight, although, as noted above, this will besubject to therapeutic discretion. Even more preferably, this dose is atleast 0.01 mg/kg/day, and most preferably for humans between about 0.01and 1 mg/kg/day. If given continuously, the MPIF-1, M-CIF or MIP-4polypeptide is typically administered at a dose rate of about 1μg/kg/hour to about 50 μg/kg/hour, either by 1-4 injections per day orby continuous subcutaneous infusions, for example, using a mini-pump. Anintravenous bag solution may also be employed. The length of treatmentneeded to observe changes and the interval following treatment forresponses to occur appears to vary depending on the desired effect.

[0397] Pharmaceutical compositions containing the MPIF-1, M-CIF or MIP-4of the invention may be administered orally, rectally, parenterally,intracisternally, intravaginally, intraperitoneally, topically (as bypowders, ointments, drops or transdermal patch), bucally, or as an oralor nasal spray.

[0398] Gene Therapy

[0399] The chemokine polypeptides, and agonists or antagonists which arepolypeptides, may be employed in accordance with the present inventionby expression of such polypeptides in vivo, which is often referred toas “gene therapy.”

[0400] Thus, for example, cells from a patient can be engineered with apolynucleotide (DNA or RNA) encoding a polypeptide ex vivo, with theengineered cells then being provided to a patient to be treated with thepolypeptides. Such methods are well-known in the art. For example, cellscan be engineered by procedures known in the art by use of a retroviralparticle containing RNA encoding the polypeptides of the presentinvention.

[0401] Similarly, cells can be engineered in vivo for expression of apolypeptides in vivo by, for example, procedures known in the art. Asknown in the art, a producer cell for producing a retroviral particlecontaining RNA encoding the polypeptides of the present invention can beadministered to a patient for engineering the cells in vivo andexpression of the polypeptides in vivo. These and other methods foradministering polypeptides of the present invention by such methodshould be apparent to those skilled in the art from the teachings of thepresent invention. For example, the expression vehicle for engineeringcells can be other than a retrovirus, for example, an adenovirus whichcan be used to engineer cells in vivo after combination with a suitabledelivery vehicle.

[0402] The retroviral plasmid vectors may be derived from retroviruseswhich include, but are not limited to, Moloney Murine Sarcoma Virus,Moloney Murine Leukemia Virus, spleen necrosis virus, Rous Sarcoma Virusand Harvey Sarcoma Virus.

[0403] In a preferred embodiment the retroviral expression vector,pMV-7, is flanked by the long terminal repeats (LTRs) of the Moloneymurine sarcoma virus and contains the selectable drug resistance geneneo under the regulation of the herpes simplex virus (HSV) thymidinekinase (tk) promoter. Unique EcoRI and HindIII sites facilitate theintroduction of coding sequence (Kirschmeier, P. T. et al., DNA 7:219-25(1988)).

[0404] The vectors include one or more suitable promoters which include,but are not limited to, the retroviral LTR; the SV40 promoter; and thehuman cytomegalovirus (CMV) promoter described in Miller, et al.,Biotechniaues, Vol. 7, No. 9:980-990 (1989), or any other promoter (e.gcellular promoters such as eukaryotic cellular promoters including, butnot limited to, the histone, pol III, and β-actin promoters). Theselection of a suitable promoter will be apparent to those skilled inthe art from the teachings contained herein.

[0405] The nucleic acid sequence encoding the polypeptide of the presentinvention is under the control of a suitable promoter which includes,but is not limited to, viral thymidine kinase promoters, such as theHerpes Simplex thymidine kinase promoter; retroviral LTRs, the β-actinpromoter, and the native promoter which controls the gene encoding thepolypeptide.

[0406] The retroviral plasmid vector is employed to transduce packagingcell lines to form producer cell lines. Examples of packaging cellswhich may be transfected include, but are not limited to, the PE50 1,PA317 and GP+am12. The vector may transduce the packaging cells throughany means known in the art. Such means include, but are not limited to,electroporation, the use of liposomes, and CaPO₄ precipitation.

[0407] The producer cell line generates infectious retroviral vectorparticles which include the nucleic acid sequence(s) encoding thepolypeptides. Such retroviral vector particles then may be employed, totransduce eukaryotic cells, either in vitro or in vivo. The transducedeukaryotic cells will express the nucleic acid sequence(s) encoding thepolypeptide. Eukaryotic cells which may be transduced, include but arenot limited to, fibroblasts and endothelial cells.

[0408] The present invention will be further described with reference tothe following examples; however, it is to be understood that the presentinvention is not limited to such examples. All parts or amounts, unlessotherwise specified, are by weight.

[0409] In order to facilitate understanding of the following examplescertain frequently occurring methods and/or terms will be described.“Plasmids” are designated by a lower case p preceded and/or followed bycapital letters and/or numbers. The starting plasmids herein are eithercommercially available, publicly available on an unrestricted basis, orcan be constructed from available plasmids in accord with publishedprocedures. In addition, equivalent plasmids to those described areknown in the art and will be apparent to the ordinarily skilled artisan.

[0410] “Digestion” of DNA refers to catalytic cleavage of the DNA with arestriction enzyme that acts only at certain sequences in the DNA. Thevarious restriction enzymes used herein are commercially available andtheir reaction conditions, cofactors and other requirements were used aswould be known to the ordinarily skilled artisan. For analyticalpurposes, typically 1 μg of plasmid or DNA fragment is used with about 2units of enzyme in about 20 μl of buffer solution. For the purpose ofisolating DNA fragments for plasmid construction, typically 5 to 50 μgof DNA are digested with 20 to 250 units of enzyme in a larger volume.Appropriate buffers and substrate amounts for particular restrictionenzymes are specified by the manufacturer. Incubation times of about 1hour at 37° C. are ordinarily used, but can vary in accordance with thesupplier's instructions. After digestion the reaction is electrophoreseddirectly on a polyacrylamide gel to isolate the desired fragment.

[0411] Size separation of the cleaved fragments is performed using 8percent polyacrylamide gel described by Goeddel, D. et al., NucleicAcids Res., 8:4057 (1980).

[0412] “Oligonucleotides” refers to either a single strandedpolydeoxynucleotide or two complementary polydeoxynucleotide strandswhich can be chemically synthesized. Such synthetic oligonucleotideshave no 5′ phosphate and thus will not ligate to another oligonucleotidewithout adding a phosphate with an ATP in the presence of a kinase. Asynthetic oligonucleotide will ligate to a fragment that has not beendephosphorylated.

[0413] “Ligation” refers to the process of forming phosphodiester bondsbetween two double stranded nucleic acid fragments (Maniatis, T., etal., Id., p. 146). Unless otherwise provided, ligation can beaccomplished using known buffers and conditions with 10 units to T4 DNAligase (“ligase”) per 0.5 μg of approximately equimolar amounts of theDNA fragments to be ligated.

[0414] Unless otherwise stated, transformation was performed asdescribed in the method of Graham, F. and Van der Eb, A., Virology,52:456-457 (1973).

[0415] Having now generally described the invention, the same will bemore readily understood through reference to the following example whichis provided by way of illustration, and is not intended to be limitingof the present invention.

Example 1

[0416] Bacterial Expression and Purification of MPIF-1

[0417] The DNA sequence encoding for MPIF-1, ATCC #75676 is initiallyamplified using PCR oligonucleotide primers corresponding to the 5′ andsequences of the processed MPIF-1 protein (minus the signal peptidesequence) and the vector sequences 3′ to the MPIF-1 gene. Additionalnucleotides corresponding to Bam HI and XbaI were added to the 5′ and 3′sequences respectively. The 5′ oligonucleotide primer has the sequence5′-TCAGGATCCGTCACAAAAGATGCAGA-3′ (SEQ ID NO:7) contains a BamHIrestriction enzyme site followed by 18 nucleotides of MPIF-1 codingsequence starting from the presumed terminal amino acid of the processedprotein codon. The 3′ sequence 5′-CGCTCTAGAGTAAAACGACGGCCAGT-3′ (SEQ IDNO:8) contains complementary sequences to an XbaI site.

[0418] The restriction enzyme sites correspond to the restriction enzymesites on the bacterial expression vector pQE-9 (Qiagen, Inc. Chatsworth,Calif.). pQE-9 encodes antibiotic resistance (Amp^(r)), a bacterialorigin of replication (ori), an IPTG-regulatable promoter operator(P/O), a ribosome binding site (RBS), a 6-His tag and restriction enzymesites. pQE-9 is then digested with BamHI and XbaI. The amplifiedsequences are ligated into pQE-9 and are inserted in frame with thesequence encoding for the histidine tag and the RBS. The ligationmixture is then used to transform E. coli strain M15/rep4 available fromQiagen. M15/rep4 contains multiple copies of the plasmid pREP4, whichexpresses the lacI repressor and also confers kanamycin resistance(Kan^(r)). Transformants are identified by their ability to grow on LBplates and ampicillin/kanamycin resistant colonies are selected. PlasmidDNA is isolated and confirmed by restriction analysis overnight (O/N) inliquid culture in LB media supplemented with both Amp (100 ug/ml) andKan (25 ug/ml). The O/N culture is used to inoculate a large culture ata ratio of 1:100 to 1:250. The cells are grown to an optical density 600(O.D.⁶⁰⁰) of between 0.4 and 0.6. IPTG (“Isopropyl-B-D-thiogalactopyranoside”) is then added to a final concentration of 1 mM. IPTGinduces by inactivating the lacI repressor, clearing the P/O leading toincreased gene expression. Cells are grown an extra 3 to 4 hours. Cellsare then harvested by centrifugation. The cell pellet is solubilized inthe chaotropic agent 6 M Guanidine HCl. After clarification, solubilizedMPIF-1 is purified from this solution by chromatography on aNickel-Chelate column under conditions that allow for tight binding byproteins containing the 6-His tag. Hochuli, E. et al., J. Chromatography411:177-184 (1984). MPIF-1 (95% pure) is eluted from the column in 6 Mguanidine HCl pH 5.0 and for the purpose of renaturation adjusted to 3 Mguanidine HCl, 100 mM sodium phosphate, 10 mM glutathione (reduced) and2 mM glutathione (oxidized). After incubation in this solution for 12hours the protein is dialyzed to 10 mM sodium phosphate.

[0419] Alternatively, the following non-tagged primers were used toclone the gene into plasmid pQE70: 5′primer: 5′ CCC GCA TGC GGG TCA CAAAAG ATG CAG 3′       SphI 3′primer 5′ AAA GGA TCC TCA ATT CTT CCT GGTCTT 3′       BamHI Stop

[0420] Construction of E. coli optimized MPIF-1

[0421] In order to increase expression levels of MPIF-1 in an E. coliexpression system, the codons of the gene were optimized to highly usedE. coli codons. For the synthesis of the optimized region of MPIF-1, aseries of 4 oligonucleotides were made: mpif-1 oligo numbers 1-4 (setforth below). These overlapping oligos were used in a PCR reaction forseven rounds at the following conditions: Denaturation 95 degrees 20seconds Annealing 58 degrees 20 seconds Extension 72 degrees 60 seconds

[0422] Following the seven rounds of synthesis, a 5′ primer to thisregion, (ACA TGC ATG CGU GUU ACC AAA GAC GCU GAA ACC GAA UUC AUG AUGUCC) and a 3′ primer to this entire region, (GCC CAA GCT TTC AGT TTT TACGGG TTT TGA TAC GGG), were added to a PCR reaction, containing 1microliters from the initial reaction of the six oligonucleotides. Thisproduct was amplified for 30 rounds using the following conditions:Denaturation 95 degrees 20 seconds Annealing 55 degrees 20 secondsExtension 72 degrees 60 seconds

[0423] The product produced by this final reaction was restricted withSph I and HindIII, and cloned into pQE70, which was also cut with Sph Iand HindIII. These clones were expressed and found to have superiorexpression levels that without the above mutations. mpif oligo number 1:5′ GCA TGC GUG UUA CCA AAG ACG CUG AAA CCG AAU UCA UGA UGU CCA AAC UGCCGC UGG AAA ACC CGG UUC UGC UGG ACC GUU UCC ACG C 3′ mpif-1 oligo number2: 5′ GCU GGA AUC CUA CUU CGA AAC CAA CUC CGA AUG CUC CAA ACC GGG UGUUAU CUU CCU GAC CAA AAA AGG UCG UCG UUU CUG CGC UAA CCC GUC CGA CAA ACAGG 3′ mpif1 oligo number 3: 5′ AAG CCT TCA GTT TTT ACG GGT TTT GAT ACGGGT GTC CAG TTT CAG CAT ACG CAT ACA AAC CTG AAC CTG TTT GTC GGA CGG GTTAGC GC 3′ mpif-1 oligo number 4: 5′ GGT TTC GAA GTA GGA TTC CAG CAG GGAGCA CGG GAT GGA ACG CGG GGT GTA GGA GAT GCA GCA GTC AGC GGA GGT AGC GTGGAA ACG GTC CAG C 3′

[0424] Construction of MPIF-1 Deletion Mutants

[0425] Deletion mutants were constructed from the 5′ terminus of theMPIF-1 gene using the E. coli optimized MPIF-1 construct set forthabove. The primers used to construct the 5′ deletions are set forthbelow. The PCR amplification was performed as set forth above for the E.coli optimized MPIF-1 construct. The products for the Delta 17-Aqe6,Delta 23, Delta 28 were restricted with NcoI for the 5′ site and HindIIIfor the 3′ site and cloned into plasmid pQE60 that was digested withNcoI and HindIII. All other products were restricted with SphI for the5′ site and HindIII for the 3′ site and cloned into plasmid pQE70 thatwas digested with SphI and HindIII.

[0426] The 5′ primers used are as follows:

[0427] Delta 17-A qe6 (pQE60)

[0428] 5′ NcoI gc gca g ccatgg aa aac ccg gtt ctg ctg gac 3′

[0429] The resulting amino acid sequence of this deletion mutant:

MENPVLLDRFHATSADCCISYTPRSIPCSLLESYFETNSECSKPGVIFLTKKGRRFCANPSDKQVQVCMRMLKLDTRIKTRKN

[0430] Delta 16-A qe7 (pQE70)

[0431] 5′ SphI gc cat g gcatgc tg gaa aac ccg gtt ctg ctg gac

[0432] The resulting amino acid sequence of this deletion mutant:

MLENPVLLDRFHATSADCCISYTPRSIPCSLLESYFETNSECSKPGVIFLTKKGRRFCANPSDKQVQVCMRMLKLDTRIKTRKN

[0433] Delta 23 (pQE60)

[0434] 5′ NcoI gc gca g ccatgg ac cgt ttc cac gct acc tcc

[0435] The resulting amino acid sequence of this deletion mutant:

MDRFHATSADCCISYTPRSIPCSLLESYFETNSECSKPGVIFLTKKGRRFCANPSDKQVQVCMRMLKLDTRIKTRKN

[0436] Delta 24 (pQE70)

[0437] 5′ SphI gcc atg gcatgc gtt tcc acg cta cct cc

[0438] The resulting amino acid sequence of this deletion mutant:

MRFHATSADCCISYTPRSIPCSLLESYFETNSECSKPGVIFLTKKGRRFCANPSDKQVQVCMRMLKLDTRIKTRKN

[0439] Delta 28 (pQE60)

[0440] 5′ NcoI gcg cag ccatgg cta cct ccg ctg act gct gc

[0441] The resulting amino acid sequence of this deletion mutant:

MATSADCCISYTPRSIPCSLLESYFETNSECSKPGVIFLTKKGRRFCANPSDKQVQVCMRMLKLDTRIKTRKN

[0442] S70 to A mutant (Ser at position 70 was mutated to Ala) (pQE70)antisense ttc gaa gta ggc ttc cag cag sense ctg ctg gaa gcc tac ttc gaa5′ SphI full gcc atg gc atg c gtg tta cca aag acg ctg aaa cc

[0443] The resulting amino acid sequence of this deletion mutant:

MRVTKDAETEFMMSKLPLENPVLLDRFHATSADCCISYTPRSIPCSLLEaYFETNSECSKPGVIFLTKKGRRFCANPSDKQVQVCMRMLKLDTRIKTRKN.

[0444] The 3′ pimer used for all constructs: 3′ HindIII gcc c aagctt tcagt ttt tac ggg ttt tga tac ggg

[0445] The full length MPIF-1 sequence (from E. coli biased nt's)

MRVTKDAETEFMMSKLPLENPVLLDRFHATSADCCISYTPRSIPCSLLESYFETNSECSKPGVIFLTKKGRRFCANPSDKQVQVCMRMLKLDTRIKTRKN.

Example 2

[0446] Bacterial Expression and Purification of MIP-4

[0447] The DNA sequence encoding for MIP-4 ATCC #75675 was initiallyamplified using PCR oligonucleotide primers corresponding to the 5′sequences of the processed MIP-4 protein (minus the signal peptidesequence). Additional nucleotides corresponding to Bam HI and XbaI wereadded to the 5′ and 3′ sequences respectively. The 5′ oligonucleotideprimer has the sequence 5′-TCAGGATCCTGTGCACAAGTTGGTACC-3′ (SEQ ID NO:9)contains a BamHI restriction enzyme site followed by 18 nucleotides ofMIP-4 coding sequence starting from the presumed terminal amino acid ofthe processed protein codon; The 3′ sequence5′-CGCTCTAGAGTAAAACGACGGCCAGT-3′ (SEQ ID NO:10) contains complementarysequences to an XbaI site.

[0448] The restriction enzyme sites correspond to the restriction enzymesites on the bacterial expression vector pQE-9 (Qiagen, Inc.,Chatsworth, Calif.). pQE-9 encodes antibiotic resistance (Amp^(r)), abacterial origin of replication (ori), an IPTG-regulatable promoteroperator (P/O), a ribosome binding site (RBS), a 6-His tag andrestriction enzyme sites. pQE-9 was then digested with BamHI and XbaIThe amplified sequences were ligated into pQE-9 and were inserted inframe with the sequence encoding for the histidine tag and the RBS. Theligation mixture was then used to transform E. coli strain 15/rep4available from Qiagen. M15/rep4 contains multiple copies of the plasmidpREP4, which expresses the lacI repressor and also confers kanamycinresistance (Kan^(r)). Transformants are identified by their ability togrow on LB plates and ampicillin/kanamycin resistant colonies wereselected. Plasmid DNA was isolated and confirmed by restrictionanalysis. Transformants are identified by their ability to grow on LBplates and ampicillin/kanamycin resistant coloies were selected. PlasmidDNA was isolated and confirmed by restriction analysis. Clonescontaining the desired constructs were grown overnight (O/N) in liquidculture in LB media supplemented with both Amp (100 ug/ml) and Kan (25ug/ml). The O/N culture is used to inoculate a large culture at a ratioof 1:100 to 1:250. The cells were grown to an optical density 600(O.D.⁶⁰⁰) of between 0.4 and 0.6. IPTG (“Isopropyl-B-D-thiogalactopyranoside”) was then added to a final concentration of 1 mM. IPTGinduces by inactivating the lacI repressor, clearing the P/O leading toincreased gene expression. Cells were grown an extra 3 to 4 hours. Cellswere then harvested by centrifugation. The cell pellet was solubilizedin the chaotropic agent 6 M Guanidine HCl. After clarification,solubilized MIP-4 was purified from this solution by chromatography on aNickel-Chelate column under conditions that allow for tight binding byproteins containing the 6-His tag. Hochuli, E. et al., J. Chromatography411:177-184 (1984). MIP-4 (95% pure) was eluted from the column in 6 Mguanidine HCl pH 5.0 and for the purpose of renaturation adjusted to 3Mr guanidine HCl, 100 mM sodium phosphate, 10 mM glutathione (reduced)and 2 mM glutathione (oxidized). After incubation in this solution for12 hours the protein was dialyzed to 10 mM sodium phosphate.

[0449] Alternatively, the following non-tagged primers were used toclone the gene into plasmid pQE60: 5′ AAA AAG CTT TCA GGC ATT CAG CTTCAG 3′ pQE60    HindIII (3′ primer) 5′ AAA CCA TGG CAC AAG TTG GTA CCAAC 3′ pQE60 NcoI (5′ primer)

Example 3

[0450] Bacterial Expression and Purification of M-CIF

[0451] The DNA sequence encoding for M-CIF (ATCC #75572) is initiallyamplified using PCR oligonucleotide primers corresponding to the 5′ and3′ sequences of the processed M-CIF protein (minus the signal peptidesequence) and additional nucleotides corresponding to Bam HI and XbaIwere added to the 5′ and 3′ sequences respectively. The 5′oligonucleotide primer has the sequence5′-GCCCGCGGATCCTCCTCACGGGGACCTTAC-3′ contains a BamHI restriction enzymesite followed by 15 nucleotides of M-CIF coding sequence starting fromthe presumed terminal amino acid of the processed protein codon; The 3′sequence 5′-GCCTGCTCTAGATCAAAGCAGGGAAGCTCCAG-3′ contains complementarysequences to XbaI site a translation stop codon and the last 20nucleotides of M-CIF coding sequence.

[0452] The restriction enzyme sites correspond to the restriction enzymesites on the bacterial expression vector pQE-9. (Qiagen, Inc. 9259 EtonAvenue, Chatsworth, Calif., 91311). pQE-9 encodes antibiotic resistance(Amp^(r)), a bacterial origin of replication (ori), an IPTG-regulatablepromoter operator (P/O), a ribosome binding site (RBS), a 6-His tag andrestriction enzyme sites. pQE-9 was then digested with BamHI and XbaI.The amplified sequences were ligated into pQE-9 and were inserted inframe with the sequence encoding for the histidine tag and the RBS. FIG.6 shows a schematic representation of this arrangement. The ligationmixture was then used to transform E. coli strain available from Qiagenunder the trademark M15/rep 4. M15/rep4 contains multiple copies of theplasmid pREP4, which expresses the lacI repressor and also conferskanamycin resistance (Kan^(r)). Transformants are identified by theirability to grow on LB plates and ampicillin/kanamycin resistant colonieswere selected. Plasmid DNA was isolated and confirmed by restrictionanalysis. Clones containing the desired constructs were grown overnight(O/N) in liquid culture in LB media supplemented with both Amp (100ug/ml) and Kan (25 ug/ml). The O/N culture is used to inoculate a largeculture at a ratio of 1:100 to 1:250. The cells were grown to an opticaldensity 600 (O.D.⁶⁰⁰) of between 0.4 and 0.6. IPTG(“Isopropyl-B-D-thiogalacto pyranoside”) was then added to a finalconcentration of 1 mM. IPTG induces by inactivating the lacI repressor,clearing the P/O leading to increased gene expression. Cells were grownan extra 3 to 4 hours. Cells were then harvested by centrifugation. Thecell pellet was solubilized in the chaotropic agent 6 Molar GuanidineHCl. After clarification, solubilized M-CIF was purified from thissolution by chromatography on a Nickel-Chelate column under conditionsthat allow for tight binding by proteins containing the 6-His tagHochuli, E. et al., J. Chromatography 411:177-184 (1984). M-CIF (95%pure) was eluted from the column in 6 M guanidine HCl pH 5.0 and for thepurpose of renaturation adjusted to 3 M guanidine HCl, 100 mM sodiumphosphate, 10 mM glutathione (reduced) and 2 mM glutathione (oxidized).After incubation in this solution for 12 hours the protein was dialyzedto 10 mM sodium phosphate. The presence of a new protein correspondingto 14 kDa following induction demonstrated expression of the M-CIF (FIG.7).

[0453] Alternatively, the following non-tagged primers were used toinsert the gene into plasmid pQE60: 5′ 5′ AAA TCA TGA CCA AGA CTG AATCCT CCT 3′ primer:        BspHI 3′ 5′ AAA AAG CTT TCA GTT CTC CTT CATGTC 3′ primer:        HindIII

Example 4

[0454] Most of the vectors used for the transient expression of theMPIF-1, M-CIF or MIP-4 protein gene sequence in mammalian cells shouldcarry the SV40 origin of replication. This allows the replication of thevector to high copy numbers in cells (e.g., COS cells) which express theT antigen required for the initiation of viral DNA synthesis. Any othermammalian cell line can also be utilized for this purpose.

[0455] A typical mammalian expression vector contains the promoterelement, which mediates the initiation of transcription of mRNA, theprotein coding sequence, and signals required for the termination oftrancription and polyadenylation of the transcript. Additional elementsinclude enhancers, Kozak sequences and intervening sequences flanked bydonor and acceptor sites for RNA splicing. Highly efficienttranscription can be achieved with the early and late promoters fromSV40, the long terminal repeats (LTRs) from Retroviruses, e.g., RSV,HTLVI, HIVI and the early promoter of the cytomegalovirus (CMV).However, cellular signals can also be used (e.g., human actin promoter).Suitable expression vectors for use in practicing the present inventioninclude, for example, vectors such as pSVL and pMSG (Pharmacia, Uppsala,Sweden), pRSVcat (ATCC 37152), pSV2dhfr (ATCC 37146) and pBC12MI (ATCC67109). Mammalian host cells that could be used include, human Hela,283, H9 and Jurkart cells, mouse NIH3T3 and C127 cells, Cos 1, Cos 7 andCV1, African green monkey cells, quail QC1-3 cells, mouse L cells andChinese hamster ovary cells.

[0456] Alternatively, the gene can be expressed in stable cell linesthat contain the gene integrated into a chromosome. The co-transfectionwith a selectable marker such as dhfr, gpt, neomycin, hygromycin allowsthe identification and isolation of the transfected cells.

[0457] The transfected gene can also be amplified to express largeamounts of the encoded protein. The DHFR (dihydrofolate reductase) is auseful marker to develop cell lines that carry several hundred or evenseveral thousand copies of the gene of interest. Another usefulselection marker is the enzyme glutamine synthase (GS) (Murphy et al.,Biochem J. 227:277-279 (1991); Bebbington et al., Bio/Technology10:169-175 (1992)). Using these markers, the mammalian cells are grownin selective medium and the cells with the highest resistance areselected. These cell lines contain the amplified gene(s) integrated intoa chromosome. Chinese hamster ovary (CHO) cells are often used for theproduction of proteins.

[0458] The expression vectors pC1 and pC4 contain the strong promoter(LTR) of the Rous Sarcoma Virus (Cullen et al., Molecular and CellularBiology, 438-447 (March, 1985)) plus a fragment of the CMV-enhancer(Boshart et al., Cell 41:521-530 (1985)). Multiple cloning sites, e.g.,with the restriction enzyme cleavage sites BamHI, XbaI and Asp718,facilitate the cloning of the gene of interest. The vectors contain inaddition the 3′ intron, the polyadenylation and termination signal ofthe rat preproinsulin gene

[0459] A. Expression of Recombinant MPIF-1 in COS cells

[0460] The expression of plasmid, CMV-MPIF-1 HA is derived from a vectorpcDNAI/Amp (Invitrogen) containing: 1) SV40 origin of replication, 2)ampicillin resistance gene, 3) E. coli replication origin, 4) CMVpromoter followed by a polylinker region, a SV40 intron andpolyadenylation site. A DNA fragment encoding the entire MPIF-1precursor and a HA tag fused in frame to its 3′ end is cloned into thepolylinker region of the vector, therefore, the recombinant proteinexpression is directed under the CMV promoter. The HA tag correspond toan epitope derived from the influenza hemagglutinin protein aspreviously described (Wilson, H., et al., Cell 37:767 (1991)). Theinfusion of HA tag to our target protein allows easy detection of therecombinant protein with an antibody that recognizes the HA epitope.

[0461] The plasmid construction strategy is described as follows:

[0462] The DNA sequence, ATCC # 75676, encoding for MPIF-1 isconstructed by PCR on the original EST cloned using two primers: the 5′primer 5′-GGAAAGCTTATGAAGGTCTCCGTGGCT-3′ (SEQ ID NO: 13) contains aHindIII site followed by 18 nucleotides of MPIF-1 coding sequencestarting from the initiation codon; the 3′ sequence5′-CGCTCTAGATCAAGCGTAGTCTGGGACGTCGTATGGGTAATTCTTCCTGGTCTTGATCC-3′ (SEQID NO: 14) contains complementary sequences to Xba I site, translationstop codon, HA tag and the last 20 nucleotides of the MPIF-1 codingsequence (not including the stop codon). Therefore, the PCR productcontains a HindIII site, MPIF-1 coding sequence followed by HA tag fusedin frame, a translation termination stop codon next to the HA tag, andan XbaI site. The PCR amplified DNA fragment and the vector, pcDNAI/Amp,are digested with HindIII and XbaI restriction enzyme and ligated. Theligation mixture is transformed into E. coli strain SURE (available fromStratagene Cloning Systems, 11099 North Torrey Pines Road, La Jolla,Calif. 92037) the transformed culture is plated on ampicillin mediaplates and resistant colonies are selected. Plasmid DNA is isolated fromtransformants and examined by restriction analysis for the presence ofthe correct fragment. For expression of the recombinant MPIF-1, COScells are transfected with the expression vector by DEAE-DEXTRAN method.(J. Sambrook, E. Fritsch, T. Maniatis, Molecular Cloning: A LaboratoryManual, Cold Spring Laboratory Press, (1989)). The expression of theMPIF-1-HA protein is detected by radiolabelling and immunoprecipitationmethod. (E. Harlow, D. Lane, Antibodies: A Laboratory Manual, ColdSpring Harbor Laboratory Press, (1988)). Cells are labelled for 8 hourswith ³⁵S-cysteine two days post transfection. Culture media are thencollected and cells are lysed with detergent (RIPA buffer (150 mM NaCl,1% NP-40, 0.1% SDS, 1% NP-40, 0.5% DOC, 50 mM Tris, pH 7.5). (Wilson, I.et al., Id. 37:767 (1984)). Both cell lysate and culture media areprecipitated with a HA specific monoclonal antibody. Proteinsprecipitated are analyzed on 15% SDS-PAGE gels.

[0463] B. Cloning and Expression in CHO Cells

[0464] The vector pC1 is used for the expression of MPIF-1 protein.Plasmid pC1 is a derivative of the plasmid pSV2-dhfr (ATCC Accession No.37146). Both plasmids contain the mouse DHFR gene under control of theSV40 early promoter. Chinese hamster ovary—or other cells lackingdihydrofolate activity that are transfected with these plasmids can beselected by growing the cells in a selective medium (alpha minus MEM,Life Technologies) supplemented with the chemotherapeutic agentmethotrexate. The amplification of the DHFR genes in cells resistant tomethotrexate (MTX) has been well documented (see, e.g., Alt, F. W.,Kellems, R. M., Bertino, J. R., and Schimke, R. T., 1978, J. Biol. Chem.253:1357-1370, Hamlin, J. L. and Ma, C. 1990, Biochem. et Biophys. Acta,1097:107-143, Page, M. J. and Sydenham, M. A. 1991, Biotechnology Vol.9:64-68). Cells grown in increasing concentrations of MTX developresistance to the drug by overproducing the target enzyme, DHFR, as aresult of amplification of the DHFR gene. If a second gene is linked tothe DHFR gene it is usually co-amplified and over-expressed. It is stateof the art to develop cell lines carrying more than 1,000 copies of thegenes. Subsequently, when the methotrexate is withdrawn, cell linescontain the amplified gene integrated into the chromosome(s).

[0465] Plasmid pC1 contains for the expression of the gene of interest astrong promoter of the long terminal repeat (LTR) of the Rouse SarcomaVirus (Cullen, et al., Molecular and Cellular Biology, March1985:438-4470) plus a fragment isolated from the enhancer of theimmediate early gene of human cytomegalovirus (CMV) (Boshart et al.,Cell 41:521-530, 1985). Downstream of the promoter are the followingsingle restriction enzyme cleavage sites that allow the integration ofthe genes: BamHI, followed by the 3′ intron and the polyadenylation siteof the rat preproinsulin gene. Other high efficient promoters can alsobe used for the expression, e.g., the human β-actin promoter, the SV40early or late promoters or the long terminal repeats from otherretroviruses, e.g., HIV and HTLVI. For the polyadenylation of the mRNAother signals, e.g., from the human growth hormone or globin genes canbe used as well.

[0466] Stable cell lines carrying a gene of interest integrated into thechromosomes can also be selected upon co-transfection with a selectablemarker such as gpt, G418 or hygromycin. It is advantageous to use morethan one selectable marker in the beginning, e.g., G418 plusmethotrexate.

[0467] The plasmid pC1 is digested with the restriction enzyme BamHI andthen dephosphorylated using calf intestinal phosphates by proceduresknown in the art. The vector is then isolated from a 1% agarose gel.

[0468] The DNA sequence encoding MPIF-1, ATCC No. 75676, is amplifiedusing PCR oligonucleotide primers corresponding to the 5′ and 3′sequences of the gene:

[0469] The 5′ primer has the sequence: 5+ AAA GGA TCC GCC ACC ATG AAGGTC TCC GTG GTC 3′         BamHI    KOZAK

[0470] (SEQ ID NO:) containing the underlined BamHI restriction enzymesite and a portion of the sequence of MPIF-1 of FIG. 1 (SEQ ID NO:).Inserted into an expression vector, as described below, the 5′ end ofthe amplified fragment encoding human MPIF-1 provides an efficientsignal peptide. An efficient signal for initiation of translation ineukaryotic cells, as described by Kozak, M., J. Mol. Biol. 196:947-950(1987) is appropriately located in the vector portion of the construct.

[0471] The 3′ primer has the sequence: 5′ AAA GGA TCC TCA ATT CTT CCAGGT CTT 3′         BamHI   Stop

[0472] (SEQ ID NO:______) containing the Asp718 restriction site and aportion of nucleotides complementary to the MPIF-1 coding sequence setout in FIG. 1 (SEQ ID NO:), including the stop codon.

[0473] The amplified fragments are isolated from a 1% agarose gel asdescribed above and then digested with the endonucleases BamHI andAsp718 and then purified again on a 1% agarose gel.

[0474] The isolated fragment and the dephosphorylated vector are thenligated with T4 DNA ligase. E. coli HB101 cells are then transformed andbacteria identified that contained the plasmid pC1 inserted in thecorrect orientation using the restriction enzyme BamHI. The sequence ofthe inserted gene is confirmed by DNA sequencing.

[0475] Transfection of CHO-DHFR-cells

[0476] Chinese hamster ovary cells lacking an active DHFR enzyme areused for transfection. 5 μg of the expression plasmid C1 arecotransfected with 0.5 μg of the plasmid pSVneo using the lipofectingmethod (Felgner et al., supra). The plasmid pSV2-neo contains a dominantselectable marker, the gene neo from Tn5 encoding an enzyme that confersresistance to a group of antibiotics including G418. The cells areseeded in alpha minus MEM supplemented with 1 mg/ml G418. After 2 days,the cells are trypsinized and seeded in hybridoma cloning plates(Greiner, Germany) and cultivated from 10-14 days. After this period,single clones are trypsinized and then seeded in 6-well petri dishesusing different concentrations of methotrexate (25 nM, 50 nM, 100 nM,200 nM, 400 nM). Clones growing at the highest concentrations ofmethotrexate are then transferred to new 6-well plates containing evenhigher concentrations of methotrexate (500 nM, 1 μM, 2 μM, 5 μM). Thesame procedure is repeated until clones grow at a concentration of 100μM.

[0477] The expression of the desired gene product is analyzed by Westernblot analysis and SDS-PAGE.

Example 5

[0478] A. Expression of Recombinant MIP-4 in COS cells

[0479] The expression of plasmid, CMV-MIP-4 HA is derived from a vectorpcDNAI/Amp (Invitrogen) containing: 1) SV40 origin of replication, 2)ampicillin resistance gene, 3) E. coli replication origin, 4) CMVpromoter followed by a polylinker region, a SV40 intron andpolyadenylation site. A DNA fragment encoding the entire MIP-4 precursorand a HA tag fused in frame to its 3′ end is cloned into the polylinkerregion of the vector, therefore, the recombinant protein expression isdirected under the CMV promoter. The HA tag correspond to an epitopederived from the influenza hemagglutinin protein as previously described(Wilson, H., et al., Cell 37:767 (1984)). The infusion of HA tag to thetarget protein allows easy detection of the recombinant protein with anantibody that recognizes the HA epitope.

[0480] The plasmid construction strategy is described as follows:

[0481] The DNA sequence ATCC # 75675 encoding for MIP-4 is constructedby PCR using two primers: the 5′ primer:5′-GGAAAGCTTATGAAGGGCCTTGCAGCTGCC -3′ (SEQ ID NO:15) contains a HindIIIsite followed by 20 nucleotides of MIP-4 coding sequence starting fromthe initiation codon; the 3'sequence 5′-CGCTCTAGATCAABCGTAGTCTGGGACGTCGTATGGGTAGGCATTCAGCTTCAGGTC -3′ SEQ ID NO:16) contains complementarysequences to Xba I site, translation stop codon, HA tag and the last 19nucleotides of the MIP-4 coding sequence (not including the stop codon).Therefore, the PCR product contains a HindIII site, MIP-4 codingsequence followed by HA tag fused in frame, a translation terminationstop codon next to the HA tag, and an XbaI site. The PCR amplified DNAfragment and the vector, pcDNAI/Amp, are digested with HindIII and XbaIrestriction enzyme and ligated. The ligation mixture is transformed intoE. coli strain SURE (available from Stratagene Cloning Systems, LaJolla, Calif.) the transformed culture is plated on ampicillin mediaplates and resistant colonies are selected. Plasmid DNA is isolated fromtransformants and examined by restriction analysis for the presence ofthe correct fragment. For expression of the recombinant MIP-4, COS cellsare transfected with the expression vector by DEAE-DEXTRAN method. (J.Sambrook, E. Fritsch, T. Maniatis, Molecular Cloning: A LaboratoryManual, Cold Spring Laboratory Press, (1989)). The expression of theMIP-4-HA protein is detected by radiolabelling and immunoprecipitationmethod. (E. Harlow, D. Lane, Antibodies: A Laboratory Manual, ColdSpring Harbor Laboratory Press, (1988)). Cells are labelled for 8 hourswith ³⁵S-cysteine two days post transfection. Culture media are thencollected and cells are lysed with detergent (RIPA buffer (150 mM NaCl,1% NP-40, 0.1% SDS, 1% NP-40, 0.5% DOC, 50 mM Tris, pH 7.5). (Wilson, I.et al., Id. 37:767 (1984)). Both cell lysate and culture media areprecipitated with a HA specific monoclonal antibody. Proteinsprecipitated are analyzed on 15% SDS-PAGE gels.

[0482] B. Cloning and Expression in CHO Cells

[0483] The vector pC1 is used for the expression of MIP-4 protein.Plasmid pC1 is a derivative of the plasmid pSV2-dhfr (ATCC Accession No.37146). Both plasmids contain the mouse DHFR gene under control of theSV40 early promoter. Chinese hamster ovary—or other cells lackingdihydrofolate activity that are transfected with these plasmids can beselected by growing the cells in a selective medium (alpha minus MEM,Life Technologies) supplemented with the chemotherapeutic agentmethotrexate. The amplification of the DHFR genes in cells resistant tomethotrexate (MTX) has been well documented (see, e.g., Alt, F. W.,Kellems, R. M., Bertino, J. R., and Schimke, R. T., 1978, J. Biol. Chem.253:1357-1370, Hamlin, J. L. and Ma, C. 1990, Biochem. et Biophys. Acta,1097:107-143, Page, M. J. and Sydenham, M. A. 1991, Biotechnology Vol.9:64-68). Cells grown in increasing concentrations of MTX developresistance to the drug by overproducing the target enzyme, DHFR, as aresult of amplification of the DHFR gene. If a second gene is linked tothe DHFR gene it is usually co-amplified and over-expressed. It is stateof the art to develop cell lines carrying more than 1,000 copies of thegenes. Subsequently, when the methotrexate is withdrawn, cell linescontain the amplified gene integrated into the chromosome(s).

[0484] Plasmid pC1 contains for the expression of the gene of interest astrong promoter of the long terminal repeat (LTR) of the Rouse SarcomaVirus (Cullen, et al., Molecular and Cellular Biology, March1985:438-4470) plus a fragment isolated from the enhancer of theimmediate early gene of human cytomegalovirus (CMV) (Boshart et al.,Cell 41:521-530, 1985). Downstream of the promoter are the followingsingle restriction enzyme cleavage sites that allow the integration ofthe genes: BamHI, followed by the 3′ intron and the polyadenylation siteof the rat preproinsulin gene. Other high efficient promoters can alsobe used for the expression, e.g., the human β-actin promoter, the SV40early or late promoters or the long terminal repeats from otherretroviruses, e.g., HIV and HTLVI. For the polyadenylation of the mRNAother signals, e.g., from the human growth hormone or globin genes canbe used as well.

[0485] Stable cell lines carrying a gene of interest integrated into thechromosomes can also be selected upon co-transfection with a selectablemarker such as gpt, G418 or hygromycin. It is advantageous to use morethan one selectable marker in the beginning, e.g., G418 plusmethotrexate.

[0486] The plasmid pC1 is digested with the restriction enzyme BamHI andthen dephosphorylated using calf intestinal phosphates by proceduresknown in the art. The vector is then isolated from a 1% agarose gel.

[0487] The DNA sequence encoding MIP-4, ATCC No. 75675, is amplifiedusing PCR oligonucleotide primers corresponding to the 5′ and 3′sequences of the gene:

[0488] The 5′ primer has the sequence 5′ 5′ AAA GGA TCC GCC ACC ATG AAGGGC CTT GCA AGC 3′        BamHI   KOZAK

[0489] (SEQ ID NO:) containing the underlined BamHI restriction enzymesite and a portion of the encoding sequence of MIP-4 of FIG. 3 (SEQ IDNO:). Inserted into an expression vector, as described below, the 5′ endof the amplified fragment encoding human MIP-4 provides an efficientsignal peptide. An efficient signal for initiation of translation ineukaryotic cells, as described by Kozak, M., J. Mol. Biol. 196:947-950(1987) is appropriately located in the vector portion of the construct.

[0490] The 3 ′ primer has the sequence: 5′ AAA GGA TCC TCA GGC ATT CAGCTT CAG 3′        BamHI     Stop

[0491] (SEQ ID NO:______) containing the Asp718 restriction sitefollowed by nucleotides complementary to a portion of the MIP-4 codingsequence set out in FIG. 3 (SEQ ID NO:), including the stop codon.

[0492] The amplified fragments are isolated from a 1% agarose gel asdescribed above and then digested with the endonucleases BamHI andAsp718 and then purified again on a 1% agarose gel.

[0493] The isolated fragment and the dephosphorylated vector are thenligated with T4 DNA ligase. E. coli HB 101 cells are then transformedand bacteria identified that contained the plasmid pC1 inserted in thecorrect orientation using the restriction enzyme BamHI. The sequence ofthe inserted gene is confirmed by DNA sequencing.

[0494] Transfection of CHO-DHFR-cells

[0495] Chinese hamster ovary cells lacking an active DHFR enzyme areused for transfection. 5 μg of the expression plasmid C1 arecotransfected with 0.5 μg of the plasmid pSVneo using the lipofectingmethod (Felgner et al., supra). The plasmid pSV2-neo contains a dominantselectable marker, the gene neo from Tn5 encoding an enzyme that confersresistance to a group of antibiotics including G418. The cells areseeded in alpha minus MEM supplemented with 1 mg/ml G418. After 2 days,the cells are trypsinized and seeded in hybridoma cloning plates(Greiner, Germany) and cultivated from 10-14 days. After this period,single clones are trypsinized and then seeded in 6-well petri dishesusing different concentrations of methotrexate (25 nM, 50 nM, 100 nM,200 nM, 400 nM). Clones growing at the highest concentrations ofmethotrexate are then transferred to new 6-well plates containing evenhigher concentrations of methotrexate (500 nM, 1 μM, 2 μM, 5 μM). Thesame procedure is repeated until clones grow at a concentration of 100μM.

[0496] The expression of the desired gene product is analyzed by Westernblot analysis and SDS-PAGE.

Example 6 A. Expression of Recombinant M-CIF in COS cells

[0497] The expression of plasmid, CMV-M-CIF HA is derived from a vectorpcDNAI/Amp (Invitrogen) containing: 1) SV40 origin of replication, 2)ampicillin resistance gene, 3) E. coli replication origin, 4) CMVpromoter followed by a polylinker region, a SV40 intron andpolyadenylation site. A DNA fragment encoding the entire M-CIF precursorand a HA tag fused in frame to its 3′ end was cloned into the polylinkerregion of the vector, therefore, the recombinant protein expression isdirected under the CMV promoter. The HA tag correspond to an epitopederived from the influenza hemagglutinin protein as previously described(I. Wilson, H. Niman, R. Heighten, A Cherenson, M. Connolly, and R.Lemer, 1984, Cell 37, 767). The infusion of HA tag to our target proteinallows easy detection of the recombinant protein with an antibody thatrecognizes the HA epitope.

[0498] The plasmid construction strategy is described as follows:

[0499] The DNA sequence encoding for M-CIF, ATCC # 75572, wasconstructed by PCR using two primers: the 5′ primer5′-GGAAAGCTTATGAAGATTCCG TGGCTGC-3′ (SEQ ID NO:17) contains a HindIIIsite followed by 20 nucleotides of M-CIF coding sequence starting fromthe initiation codon; the 3′ sequence 5′-CGCTCTAGATCAAGCGTAGTCTGGGACGTCGTATGGGTAGTTCTCCTTCAT GTCCTTG -3′ (SEQ ID NO:18) contains complementary sequences to Xba I site, translation stopcodon, HA tag and the last 19 nucleotides of the M-CIF coding sequence(not including the stop codon). Therefore, the PCR product contains aHindIII site, M-CIF coding sequence followed by HA tag fused in frame, atranslation termination stop codon next to the HA tag, and an XbaI site.The PCR amplified DNA fragment and the vector, pcDNAI/Amp, were digestedwith HindIII and XbaI restriction enzyme and ligated. The ligationmixture was transformed into E. coli strain SURE (Stratagene CloningSystems, La Jolla, Calif.) the transformed culture was plated onampicillin media plates and resistant colonies were selected. PlasmidDNA was isolated from transformants and examined by restriction analysisfor the presence of the correct fragment. For expression of therecombinant M-CIF, COS cells were transfected with the expression vectorby DEAE-DEXTRAN method. (J. Sambrook, E. Fritsch, T. Maniatis, MolecularCloning: A Laboratory Manual, Cold Spring Laboratory Press, (1989)). Theexpression of the M-CIF-HA protein was detected by radiolabelling andimmunoprecipitation method. (E. Harlow, D. Lane, Antibodies: ALaboratory Manual, Cold Spring Harbor Laboratory Press, (1988)). Cellswere labelled for 8 hours with ³⁵S-cysteine two days post transfection.Culture media were then collected and cells were lysed with detergent(RIPA buffer (150 mM NaCl, 1% NP-40, 0.1% SDS, 1% NP-40, 0.5% DOC, 50 mMTris, pH 7.5). (Wilson, I. et al., Id. 37:767 (1984)). Both cell lysateand culture media were precipitated with a HA specific monoclonalantibody. Proteins precipitated were analyzed on 15% SDS-PAGE gels.

[0500] B. Cloning and Expression in CHO Cells

[0501] The vector pC1 is used for the expression of M-CIF protein.Plasmid pC1 is a derivative of the plasmid pSV2-dhfr (ATCC Accession No.37146). Both plasmids contain the mouse DHFR gene under control of theSV40 early promoter. Chinese hamster ovary—or other cells lackingdihydrofolate activity that are transfected with these plasmids can beselected by growing the cells in a selective medium (alpha minus MEM,Life Technologies) supplemented with the chemotherapeutic agentmethotrexate. The amplification of the DHFR genes in cells resistant tomethotrexate (MTX) has been well documented (see, e.g., Alt, F. W.,Kellems, R. M., Bertino, J. R., and Schinike, R. T., 1978, J. Biol.Chem. 253:1357-1370, Hamlin, J. L. and Ma, C. 1990, Biochem. et Biophys.Acta, 1097:107-143, Page, M. J. and Sydenham, M. A. 1991, BiotechnologyVol. 9:64-68). Cells grown in increasing concentrations of MTX developresistance to the drug by overproducing the target enzyme, DHFR, as aresult of amplification of the DHFR gene. If a second gene is linked tothe DHFR gene it is usually co-amplified and over-expressed. It is stateof the art to develop cell lines carrying more than 1,000 copies of thegenes. Subsequently, when the methotrexate is withdrawn, cell linescontain the amplified gene integrated into the chromosome(s).

[0502] Plasmid pC1 contains for the expression of the gene of interest astrong promoter of the long terminal repeat (LTR) of the Rouse SarcomaVirus (Cullen, et al., Molecular and Cellular Biology, March1985:438-4470) plus a fragment isolated from the enhancer of theimmediate early gene of human cytomegalovirus (CMV) (Boshart et al.,Cell 41:521-530, 1985). Downstream of the promoter are the followingsingle restriction enzyme cleavage sites that allow the integration ofthe genes: BamHI, followed by the 3′ intron and the polyadenylation siteof the rat preproinsulin gene. Other high efficient promoters can alsobe used for the expression, e.g., the human β-actin promoter, the SV40early or late promoters or the long terminal repeats from otherretroviruses, e.g., HIV and HTLVI. For the polyadenylation of the mRNAother signals, e.g., from the human growth hormone or globin genes canbe used as well.

[0503] Stable cell lines carrying a gene of interest integrated into thechromosomes can also be selected upon co-transfection with a selectablemarker such as gpt, G418 or hygromycin. It is advantageous to use morethan one selectable marker in the beginning, e.g., G418 plusmethotrexate.

[0504] The plasmid pC1 is digested with the restriction enzyme BamHI andthen dephosphorylated using calf intestinal phosphates by proceduresknown in the art. The vector is then isolated from a 1% agarose gel.

[0505] The DNA sequence encoding M-CIF, ATCC No. 75572, is amplifiedusing PCR oligonucleotide primers corresponding to the 5′ and 3′sequences of the gene:

[0506] The 5′ primer has the sequence: 5′ AAA GGA TCC GCC ACC ATG AAGATC TCC GTG GCT 3′ (SEQ ID NO:)         BamHI    KOZAK

[0507] containing the underlined BamHI restriction enzyme site and thesequence of M-CIF of FIG. 1 (SEQ ID NO:1). Inserted into an expressionvector, as described below, the 5′ end of the amplified fragmentencoding human M-CIF provides an efficient signal peptide. An efficientsignal for initiation of translation in eukaryotic cells, as describedby Kozak, M., J. Mol. Biol. 196:947-950 (1987) is appropriately locatedin the vector portion of the construct.

[0508] The 3′ primer has the sequence: 5′ AAA GGA TCC TCA GTT CTC CTTCAT GTC CTT 3′         BamHI    Stop

[0509] (SEQ ID NO:) containing the Asp718 restriction site and a portionof the M-CIF coding sequence set out in FIG. 2 (SEQ ID NO:2), includingthe stop codon.

[0510] The amplified fragments are isolated from a 1% agarose gel asdescribed above and then digested with the endonucleases BamHI andAsp718 and then purified again on a 1% agarose gel.

[0511] The isolated fragment and the dephosphorylated vector are thenligated with T4 DNA ligase. E. coli HB 101 cells are then transformedand bacteria identified that contained the plasmid pC1 inserted in thecorrect orientation using the restriction enzyme BamHI. The sequence ofthe inserted gene is confirmed by DNA sequencing.

[0512] Transfection of CHO-DHFR-cells

[0513] Chinese hamster ovary cells lacking an active DHFR enzyme areused for transfection. 5 μg of the expression plasmid Cl arecotransfected with 0.5 μg of the plasmid pSVneo using the lipofectingmethod (Felgner et al., supra). The plasmid pSV2-neo contains a dominantselectable marker, the gene neo from Tn5 encoding an enzyme that confersresistance to a group of antibiotics including G418. The cells areseeded in alpha minus MEM supplemented with 1 mg/ml G418. After 2 days,the cells are trypsinized and seeded in hybridoma cloning plates(Greiner, Germany) and cultivated from 10-14 days. After this period,single clones are trypsinized and then seeded in 6-well petri dishesusing different concentrations of methotrexate (25 nM, 50 nM, 100 nM,200 nM, 400 nM). Clones growing at the highest concentrations ofmethotrexate are then transferred to new 6-well plates containing evenhigher concentrations of methotrexate (500 nM, 1 μM, 2 μM, 5 μM). Thesame procedure is repeated until clones grow at a concentration of 100μM.

[0514] The expression of the desired gene product is analyzed by Westernblot analysis and SDS-PAGE.

Example 7

[0515] Expression pattern of M-CIF in human tissue

[0516] Northern blot analysis was carried out to examine the levels ofexpression of M-CIF in human tissues. Total cellular RNA samples wereisolated with RNAzol™ B system (Biotecx Laboratories, Inc. Houston,Tex.). About 10 ug of total RNA isolated from each human tissuespecified was separated on 1% agarose gel and blotted onto a nylonfilter. (Sambrook, Fritsch, and Maniatis, Molecular Cloning, ALaboratory Manual, Cold Spring Harbor Press, (1989)). The labelingreaction was done according to the Stratagene Prime-It kit with 50 ngDNA fragment. The labeled DNA was purified with a Select-G-50 column. (5Prime-3 Prime, Inc., Boulder, Colo.). The filter was then hybridizedwith radioactive labeled full length M-CIF gene at 1,000,000 cpm/ml in0.5 M NaPO₄, pH 7.4 and 7% SDS overnight at 65° C. After wash twice atroom temperature and twice at 60° C. with 0.5×SSC, 0.1% SDS, the filterwas then exposed at −70° C. overnight with an intensifying screen.

Example 8

[0517] Expression pattern of MPIF-1 in human tissue

[0518] Northern blot analysis was carried out to examine the levels ofexpression of MPIF-1 in human tissues. Total cellular RNA samples wereisolated with RNAzol™ B system (Biotecx Laboratories, Inc. 6023 SouthLoop East, Houston, Tex. 77033). About 10 ug of total RNA isolated fromeach human tissue specified is separated on 1% agarose gel and blottedonto a nylon filter. (Sambrook, Fritsch, and Maniatis, MolecularCloning, Cold Spring Harbor Press, (1989)). The labeling reaction isdone according to the Stratagene Prime-It kit with 50 ng DNA fragment.The labeled DNA is purified with a Select-G-50 column. (5 Prime -3Prime, Inc. 5603 Arapahoe Road, Boulder, Colo. 80303). The filter isthen hybridized with radioactive labeled full length MPIF-1 gene at1,000,000 cpm/ml in 0.5 M NaPO₄, pH 7.4 and 7% SDS overnight at 65° C.After wash twice at room temperature and twice at 60° C. with 0.5×SSC,0.1% SDS, the filter is then exposed at −70° C. overnight with anintensifying screen.

Example 9

[0519] Expression pattern of MIP-4 in human cells

[0520] Northern blot analysis was carried out to examine the levels ofexpression of MIP-4 in human cells. Total cellular RNA samples wereisolated with RNAzol™ B system (Biotecx Laboratories, Inc. 6023 SouthLoop East, Houston, Tex. 77033). About 10 ug of total RNA isolated fromeach human tissue specified was separated on 1% agarose gel and blottedonto a nylon filter. (Sambrook, Fritsch, and Maniatis, MolecularCloning, Cold Spring Harbor Press, (1989)). The labeling reaction wasdone according to the Stratagene Prime-It kit with 50 ng DNA fragment.The labeled DNA was purified with a Select-G-50 column. (5 Prime-3Prime, Inc. 5603 Arapahoe Road, Boulder, Colo. 80303). The filter wasthen hybridized with radioactive labeled full length MIP-4 gene at1,000,000 cpm/ml in 0.5 M NaPO4, pH 7.4 and 7% SDS overnight at 65° C.After wash twice at room temperature and twice at 60° C. with 0.5×SSC,0.1% SDS, the filter was then exposed at −70° C. overnight with anintensifying screen. See FIG. 6.

Example 10

[0521] Expression and Purification of Chemokine MPIF-1 using abaculovirus expression system

[0522] SF9 cells were infected with a recombinant baculovirus designedto express the MPIF-1 cDNA. Cells were infected at an MOI of 2 andcultured at 28° C. for 72-96 hours. Cellular debris from the infectedculture was removed by low speed centrifugation. Protease inhibitorcocktail was added to the supernatant at a final concentration of 20μg/ml Pefabloc SC, 1 μg/ml leupeptin, 1 μg/ml E-64 and I mM EDTA. Thelevel of MPIF-1 in the supernatant was monitored by loading 20-30 μl ofsupernatant only 15% SDS-PAGE gels. MPIF-1 was detected as a visible 9Kd band, corresponding to an expression level of several mg per liter.MPIF-1 was further purified through a three-step purification procedure:Heparin binding affinity chromatography. Supernatant of baculovirusculture was-mixed with ⅓ volume of buffer containing 100 mMHEPES/MES/NaOAc pH 6 and filtered through 0.22 μm membrane. The samplewas then applied to a heparin binding column (HEI poros 20,Bi-Perceptive System Inc.). MPIF-1 was eluted at approximately 300 mMNaCl in a linear gradient of 50 to 500 mM NaCl in 50 mM HEPES/MES/NaOAcat pH 6; Cation exchange chromatography. The MPIF-1-enriched fromheparin chromatography was subjected to a 5-fold dilution with a buffercontaining 50 mM HEPES/MES/NaOAc pH 6. The resultant mixture was thenapplied to a cation exchange column (S/M poros 20, Bio-Perceptive SystemInc.). MPIF-1 was eluted at 250 mM NaCl in a linear gradient of 25 to300 mM NaCl in 50 mM HEPES/MES/NaOAc at pH 6; Size exclusionchromatography. Following the cation exchange chromatography, MPIF-1 wasfurther purified by applying to a size exclusion column (HW50, TOSOHAAS, 1.4×45 cm). MPIF-1 fractionated at a position close to a 13.7 Kdmolecular weight standard (RNase A), corresponding to the dimeric formof the protein.

[0523] Following the three-step purification described above, theresultant MPIF-1 was judged to be greater than 90% pure as determinedfrom commassie blue staining of an SDS-PAGE gel (FIG. 9).

[0524] The purified MPIF-1 was also tested for endotoxin/LPScontamination. The LPS content was less than 0.1 ng/ml according to LALassays (BioWhittaker).

Example 11

[0525] Effect of baculovirus-expressed M-CIF and MPIF-1 on M-CSF andSCF-stimulated colony formation of freshly isolated bone marrow cells

[0526] A low density population of mouse bone marrow cells wereincubated in a treated tissue culture dish for one hour at 37° C. toremove monocytes, macrophages, and other cells that adhere to theplastic surface. The non-adherent population of cells were then plated(10,000 cells/dish) in agar containing growth medium in the presence orabsence of the factors shown in FIG. 14. Cultures were incubated for 10days at 37° C. (88% N₂, 5% CO₂, and 7% O₂) and colonies were scoredunder an inverted microscope. Data is expressed as mean number ofcolonies and was obtained from assays performed in triplicate.

Example 12

[0527] Effect of MPIF-1 and M-CIF on IL-3 and SCF stimulatedproliferation and differentiation of lin-population of bone marrow cells

[0528] A population of mouse bone marrow cells enriched in primitivehematopoietic progenitors was obtained using a negative selectionprocedure, where the committed cells of most of the lineages wereremoved using a panel of monoclonal antibodies (anti cd11b, CD4, CD8,CD45R, and Gr-1 antigens) and magnetic beads. The resulting populationof cells (lineage depleted cells) were plated (5×10⁴ cells/ml) in thepresence or absence of the indicated chemokine (50 ng/ml) in a growthmedium supplemented with IL-3 (5 ng/ml) plus SCF (100 ng/ml). Afterseven days of incubation at 37° C. in a humidified incubator (5% CO₂, 7%O₂, and 88% N environment), cells were harvested and assayed for theHPP-CFC, and immature progenitors. In addition, cells were analyzed forthe expression of certain differentiation antigens by FACScan. Colonydata are expressed as mean number of colonies±SD) and were obtained fromassays performed in six dishes for each population of cells (FIG. 15).

Example 13

[0529] MPIF-1 inhibits colony formation in response to IL-3, M-CSF, andGM-CSF

[0530] Mouse bone marrow cells were flushed from both the femur andtibia, separated on a ficol density gradient and monocytes removed byplastic adherence. The resulting population of cells were incubatedovernight in an MEM-based medium supplemented with IL-3 (5 ng/ml),GM-CSF (5 ng/ml), M-CSF (10 ng/ml) and G-CSF (10 ng/ml). These cellswere plated at 1,000 cells/dish in agar-based colony formation assays inthe presence of IL-3 (5 ng/ml), GM-CSF (5 ng/ml) or M-CSF (5 ng/ml) withor without M-CIF at 50 ng/ml. The data is presented as colony formationas a percentage of the number of colonies formed with the specificfactor alone. Two experiments are shown with the data depicted as theaverage of duplicate dishes with error bars indicating the standarddeviation for each experiment (FIG. 17).

Example 14

[0531] Expression via Gene Therapy

[0532] Fibroblasts are obtained from a subject by skin biopsy. Theresulting tissue is placed in tissue-culture medium and separated intosmall pieces. Small chunks of the tissue are placed on a wet surface ofa tissue culture flask, approximately ten pieces are placed in eachflask. The flask is turned upside down, closed tight and left at roomtemperature over night. After 24 hours at room temperature, the flask isinverted and the chunks of tissue remain fixed to the bottom of theflask and fresh media (e.g Ham's F12 media, with 10% FBS, penicillin andstreptomycin, is added. This is then incubated at 37° C. forapproximately one week. At this time, fresh media is added andsubsequently changed every several days. After an additional two weeksin culture, a monolayer of fibroblasts emerge. The monolayer istrypsinized and scaled into larger flasks. pMV-7 (Kirschmeier, P. T. etal, DNA 7:219-25 (1988) flanked by the long terminal repeats of theMoloney murine sarcoma virus, is digested with EcoRI and HindIII andsubsequently treated with calf intestinal phosphatase. The linear vectoris fractionated on agarose gel and purified, using glass beads.

[0533] The cDNA encoding a polypeptide of the present invention isamplified using PCR primers which correspond to the 5′ and 3′ endsequences respectively. The 5′ primer containing an EcoRI site and the3′ primer having contains a HindIII site. Equal quantities of theMoloney murine sarcoma virus linear backbone and the EcoRI and HindIIIfragment are added together, in the presence of T4 DNA ligase. Theresulting mixture is maintained under conditions appropriate forligation of the two fragments. The ligation mixture is used to transformbacteria HB 101, which are then plated onto agar-containing kanamycinfor the purpose of confirming that the vector had the gene of interestproperly inserted.

[0534] The amphotropic pA317 or GP+am12 packaging cells are grown intissue culture to confluent density in Dulbeccol's Modified EaglesMedium (DMEM) with 10% calf serum (CS), penicillin and streptomycin. TheMSV vector containing the gene is then added to the media and thepackaging cells are transduced with the vector. The packaging cells nowproduce infectious viral particles containing the gene (the packagingcells are now referred to as producer cells).

[0535] Fresh media is added to the transduced producer cells, andsubsequently, the media is harvested from a 10 cm plate of confluentproducer cells. The spent media, containing the infectious viralparticles, is filtered through a millipore filter to remove detachedproducer cells and this media is then used to infect fibroblast cells.Media is removed from a sub-confluent plate of fibroblasts and quicklyreplaced with the media from the producer cells. This media is removedand replaced with fresh media. If the titer of virus is high, thenvirtually all fibroblasts will be infected and no selection is required.If the titer is very low, then it is necessary to use a retroviralvector that has a selectable marker, such as neo or his.

[0536] The engineered fibroblasts are then injected into the host,either alone or after having been grown to confluence on cytodex 3microcarrier beads. The fibroblasts now produce the protein product.

Example 15

[0537] In Vitro Myeloprotection

[0538] As demonstrated above, MPIF-1 is a potent inhibitor of the LowProliferative Potential Colony-Forming Cell (LPP-CFC ), a myeloidprogenitor that gives rise to granulocyte and monocyte lineages. Todemonstrate that MPIF-1 provides protection for LPP-CFC from thecytotoxicity of the cell cycle acting chemotherapeutic drug,lineage-depleted populations of cells ( Lin⁻ cells ) were isolated frommouse bone marrow and incubated in the presence of multiple cytokineswith or without MPIF-1. After 48 hours, one set of each culture received5-Fu and the incubation was then continued for additional 24 hours, atwhich point the numbers of surviving LPP-CFC were determined by aclonogenic assay. As shown in FIG. 21A, ˜40% of LPP-CFC were protectedfrom the 5-Fu-induced cytotoxicty in the presence of MPIF-1, whereaslittle protection (<5% ) of LPP-CFC was observed in the absence ofMPIF-1 or in the presence of an unrelated protein. High ProliferativePotential Colony-Forming Cells (HPP-CFC ) were not protected by MPIF-1under the same culture conditions, demonstrating specificity of theMPIF-1 protective effect.

[0539] Similar experiments were performed using the chemotherapeuticagent, Ara-C instead of 5-Fu. As shown in FIG. 21B, dramatic protectionof LPP-CFC by both from wild type MPIF-1 and a mutant MPIF-1 ( i.e.,mutant-1, see Example 17 below for description of this mutant). Thus,MPIF-1 is able to protect LPP-CFC from the cytotoxicity induced by bothchemotherapeutic drugs, 5-Fu and Ara-C.

Example 16

[0540] In Vivo Myeloprotection

[0541] The in vitro myeloprotection results suggest that myelotoxicityelicited by the cytotoxic drugs, a severe side effect observed in cancerpatients undergoing chemotherapy, might be ameliorated if the criticalcell types within the bone marrow could be protected by MPIF-1 duringthe period of action of the chemotherapeutic drugs. To demonstrate invivo myeloprotection, two types of experiments were performed in mice.In one experiment, a group of mice (Group-4) were injected (I.P.) dailyfor three days, at 24 hour intervals, with 1.0 mg/Kg MPIF-1, and on thethird day these mice were also injected (I.P.) with 5-Fu at 150 mg/Kg.Animals injected with either saline (Group-1), MPIF-1 alone (Group-2),or 5-Fu alone (Group-3) served as controls. Then, four animals from eachof the groups were sacrificed at 3, 6, and 10 days post 5-Fuadministration to determine White Blood Cell (WBC) counts in theperipheral blood. As shown in the FIG. 22, injection of MPIF-1 alone hadlittle effect on the WBC counts. As expected, 5-Fu treatment resulted ina dramatic reduction in the circulating WBC counts on day 6 post 5-Fu.Significantly, animals treated with MPIF-1 prior to 5-Fu administrationexhibited about two fold higher WBC counts in the blood compared toanimals treated with 5-Fu alone. Thus, treatment of mice with MPIF-1prior to 5-Fu results in the accelerated recovery from neutropenia.

[0542] Hematopoietic stem and multipotential progenitor cells in thebone marrow are responsible for restoring all the hematopoietic lineagesfollowing chemotherapy. In normal individuals, these cells divide lessfrequently, and are, therefore, spared from a single dose of thechemotherapeutic drug. However, these cells are killed if a second doseof the drug is administered within three days after the first dosebecause the critical progenitor cell types in the marrow are rapidlydividing during this period.

[0543] To demonstrate that MPIF-1 is able to protect these cell types inthe bone marrow, the following experiment was performed. Theexperimental was performed using three groups of mice (6 animals pergroup) that were treated as follows: Group-1, injected with saline ondays 1, 2, and 3; Group-2, injected with 5-Fu on days 0 and 3; andGroup-3, injected with 5-Fu on days 0 and 3 and MPIF-1 on days 1, 2, and3. (See FIG. 23) Bone marrow was harvested on days 6 and 9 to determineHPP-CFC and LPP-CFC frequencies using a clonogenic assay well known tothose of skill in the art. The results demonstrate that administrationof MPIF-1 prior to the second dose of 5-Fu results in a rapid recoveryof the HPP-CFC and LPP-CFC frequencies by day 9 compared to animalstreated with 5-Fu alone. (See, FIG. 24).

Example 17

[0544] Studies with the MPIF-1 mutants

[0545] A number of MPIF-1 variants that are truncated from theN-terminus have been identified and characterized. The amino terminalsequences of these variants as determined by Edman degradation arepresented in the FIG. 25. For example, Mutants-2, -3, -7, and -8 arosespontaneously during the purification of the mature form of MPIF-landthis preparation is called Preparation K0871. Similarly, Mutants-2, -3,-4, and -5 were discovered in another batch of the purified MPIF-1preparation (Preparation HG00300-B7). Since it was not possible topurify these variants from one another, Preparations K0871 andHG00300-B7 were used as is in the experiments described below. Mutant-6,which is identical to Mutant-3 with respect to the amino terminalsequence except for the N-terminal methionine, was generated by in vitromutagenesis. Mutant-1, which is identical to the wild type except forthe N-terminal methionine, was also generated by mutagenesis. Inaddition, an alternatively spliced form of MPIF-1 (Mutant-9), the cDNAclone of which encodes for a protein of 137 amino acids (FIG. 26A) wasdiscovered (See, FIG. 25). Comparison of the amino acid sequence forMutant-9's with that of MPIF-1 reveals an insertion of 18 amino acidsbetween residues 45 and 46 in the MPIF-1 sequence and a loss of arginine46 of MPIF-1 (FIG. 26B). The following summarizes the biologicalactivities of these MPIF-1 mutant proteins.

[0546] Intracellular Calcium mobilization

[0547] In the foregoing Examples, MPIF-1 protein has been shown tomobilize calcium in monocytes. The wild type and mutant MPIF-1 proteinswere tested for their ability to induce mobilization of intracellularcalcium in human monocytes using human MIP-1α as a positive control. Theexperiment was performed as follows: Human monocytes were isolated byelutriation and loaded with Indo-1/acetoxymethylester by incubating1×10⁶ cells in 1 ml of in HBSS containing 1 mM CaCl₂, 2 mM MgSO₄, 5 mMglucose and 10 mM HEPES, pH 7.4 plus 2.5 mM Indo-1/acetoxymethylesterfor 30 min at 37° C. Cells were then washed with HBSS and resuspended inthe same buffer at 5×10⁵ cells/ml and stimulated with variousconcentrations of the indicated proteins at 37° C. The fluorescentsignal induced in response to changes in intracellular calcium ((Ca++)i)was measured on a Hatchi F-2000 fluorescence spectrophotometer bymonitoring Indo-1 excitation at 330 nm and emission at 405 and 485 nm.The results are shown in FIG. 27.

[0548] The results demonstrate that preparations K0871, HG00300-B7, andMutant-9 are ten-fold more active than the wild type, whereas Mutants-6is indistinguishable from the wild type and Mutant-1 is about two-foldmore active than the wild type. (See, FIG. 27). Since MIP-1a and MPIF-1are 45% identical with respect to the primary amino acid sequence, itwas of interest to determine whether they interacted with the samereceptor. To explore this possibility, the ability of MPIF-1 todesensitize MIP-1 a-induced calcium mobilization was studied. FIGS. 28Aand B show that MIP-1 a and the MPIF-1 wild type protein can desensitizeeach others ability to mobilize calcium in monocytes, but not MCP-4(another beta-chemokine).

[0549] In similar experiments, preparations K0871, HG00300-B7, andMutants-1, -6, and -9 were able to block MIP-1α induced calciummobilization. This experiment was performed as follows: Calciummobilization response of human monocytes to the indicated proteins at100 ng/ml was measured as indicated above for the experiment disclosedin FIG. 27. For desensitization studies, monocytes were first exposed toone factor and when the response to the first treatment returned tobaseline a second factor was added to the same cells. No response to thesecond factor is indicated by the (−) sign and a stimulatory response tothe first factor by a (+) sign. (See, FIG. 29).

[0550] Thus, MPIF-1 and its mutant variants appear to interact with orshare a component of the cell surface receptor for MIP-1α. Recentdemonstration that the MIP-1a receptor serves as a cofactor infacilitating the entry of HIV into human monocytes and T-lymphocytesraises an interesting possibility that MPIF-1 or its variants mightinterfere with the process of HIV entry into the cells.

[0551] Chemotaxis

[0552] Chemotaxis of human peripheral blood mononuclear cell (PBMC)fraction (consisting mainly of lymphocytes and monocytes) was measuredin response to various concentrations of MPIF-1 and its variants in a96-well neuroprobe chemotaxis chambers. The experiment was peformed asfollows: cells were washed three times in HBSS with 0.1% BSA (HBSS/BSA)and resuspended at 2×10⁶/ml for labeling. Calcein-AM (Molecular Probes)was added to a final concentration of 1 mM and the cells were incubatedat 37° C. for 30 minutes. Following this incubation, the cells werewashed three times in HBSS/BSA. Labeled cells were then resuspended to8×10⁶/ml and 25 ml of this suspension (2×10⁵ cells) dispensed into eachupper chamber of a 96 well chemotaxis plate. The chemotactic agent wasdistributed at various concentrations in the bottom chamber of eachwell. The upper and the bottom chambers are separated by a polycarbonatefilter (3-5 mm pore size; PVP free; NeuroProbe, Inc.). Cells wereallowed to migrate for 45-90 minutes and then the number of migratedcells (both attached to the bottom surface of the filter as well as inthe bottom chamber) were quantitated using a Cytofluor 11 fluorescenceplate reader (PerSeptive Biosystems). Values represent concentrations atwhich peak activity was observed with the relative fold induction overbackground indicated in paraenthesis.

[0553] The results, shown in FIG. 30, demonstrate that preparationsK0871 and HG00300-B7 are more potent inducers of chemotaxis than thewild type, whereas Mutants-1 and -6 were indistinguishable from the wildtype.

[0554] Effects on colony formation by LPP-CFC

[0555] To determine the impact of MPIF-1 variants on colony formation byLPP-CFC, a limiting number of mouse bone marrow cells were plated insoft agar containing medium supplemented with multiple cytokines with orwithout various concentrations of MPIF-1 variants. The experiment wasperformed as follows: a low density population of mouse bone marrowcells were plated (1,500 cells/3.5 cm diam. dish) in agar containingmedium with or without the indicated MPIF-1 variants at variousconcentrations, but in the presence of the following recombinant murinecytokines IL-3 (5 ng/ml), SCF (100 ng/ml), IL-1 alpha (10 ng/ml), andM-CSF (5 ng/ml). Dishes were then incubated in a tissue cultureincubator for 14 days at which point LPP-CFC colonies were scored underan inverted microscope. Data presented in FIG. 31 are pooled fromseveral different experiments where each condition was assayed induplicates.

[0556] The results demonstrate that the effective concentration requiredfor 50% of maximal inhibition in the case of preparations K0871 andHG00300-B7 were 20- to 100-fold lower than that of the wild type and forMutant-6 it was 2- to 10-fold lower. (See, FIG. 31). Thus, deletion ofthe N-terminal amino acids of MPIF-1 protein results in an increasedpotency of the molecule.

Example 18

[0557] M-CIF Protection of Lipopolysaccharide-Induced Lethal Sepsis

[0558] Septic shock, a disease with significant morbidity and mortalityin humans, results from uncontrollable release of cytokines in responseto blood-borne bacterial infection. Bacterial endotoxins are recognizedas a major factor in the pathogenesis of Gram-negative septic shock(Morrison & Ryan, Annu. Rev. Med. 38:417 (1987); Wolff & Benett, N.Engl. J. Med. 291:733 (1974)), which appears to be mediated bymacrophages in response to endotoxins for the production of TNF-a andother cytokines (Freudenberg et al., Infect. Immun. 51:891 (1986).Tracey et al., Nature (Lond). 330:662 (1987)).

[0559] M-CIF is a new member of the beta-chemokine family with no invitro chemotactic activity to monocytes/macrophages and some degree ofchemotactic activity to T lymphocytes. It is inactive on most leukocytesexcept that it induces monocyte/macrophages for intracellular Ca⁺⁺change via receptors shared with MIP-1α and RANTES (Schulz-Knappe etal., J. Exp. Med. 183:295 (1996)). In addition, M-CIF has been shown tohave a strong inhibitory effect on M-CSF-induced promonocytic colonyformation (Kreider et al., Abstract for The International Society forInterferon and Cytokine Research, Geneva, Switzerland, 1996).

[0560] In the present study, we examine the effect of M-CIF onendotoxin-induced septic shock in animal models. In some experiments, tobypass the known natural resistance of mice to the effect of bacterialtoxins (Peavy et al., J. Immunol. 105:1453 (1970)), we increased theirsensitivity by pretreatment with D-galactosamine (Galanos et al., Proc.Natl. Acad. Sci. USA. 76:5939 (1979); Lehmann et al., J. Exp. Med165:657 (1987)). We show that systemic treatment of potentially septicmice with M-CIF significantly prevented LPS-induced lethal shock.

[0561] Materials and Methods

[0562] Chemicals and reagents

[0563] The endotoxins LPS (derived from E. Coli 0127:B8) andD-galactosamine were purchased from Sigma Chemical Co. (St. Louis, Mo.).Recombinant human M-CIF was produced utilizing three different vectorsystems: baculovirus, E. coli and CHO cells, for protein expression andpurification. Final protein preparations for in vivo usage containedmore than 90% M-CIF as determined by SDS-PAGE analysis and had anendotoxin level less than 4.0 EU/mg. TABLE 1 Batches and vectors ofM-CIF used in experiments Endo- % toxin Purity level M- Batch (SDS- (EU/Buffer content CIF Vector No. PAGE) mg) (NaOAc; NaCl) 1. BaculovirusB8 >95 4.0 40 mM; pH 5.5; 500 mM 2. Baculovirus B9 >95 0.2 40 mM; pH5.5; 150 mM 3. Baculovirus B11 >90 2.4 40 mM; pH 5.5; 150 mM 4. E. ColiE1   95 0.04 40 mM; pH 6.0; 400 mM 5. CHO C1 >95 0.75 50 mM; pH 6.5; 500mM

[0564] Animals

[0565] These experiments were conducted with Balb/c and CF-1 micepurchased from Harlan Sprague Dawley (Indianapolis, Ind.) and Balb/cscid/scid (SCID) mice purchased from the Animal Production Facility atNational Cancer Institute/Charles River (Frederick, Md.). All mice wereused at 8-12 weeks of age and were maintained on a standard lab dietwith free access to tap water. Animals were housed under controlledconditions in plastic microisolator cages with filter tops in a roomwith a 12 hour light cycle (6 am to 6 pm, light) and monitored 22° C.temperature and 65% humidity for at least one week before use inexperiments. SCID mice had all bedding and water autoclaved and foodirradiated before use.

[0566] Experimental design

[0567] Lethal sepsis was induced in mice with i.p. injection of LPS atvarious doses dissolved in normal saline on day 0 with or without prior(1 hour before LPS) D-gal sensitization. M-CIF from variousvectors/batches at different doses was given i.p. daily for 3consecutive days on day −1, day 0 (1 hour before LPS) and day 1. Micereceiving buffer (40 mM sodium acetate, pH 5.5; 150 mM NaCl) serve asthe disease control. Animals were monitored for morbundity and morbidity3 times/day after LPS challenge for as long as 120 hours after LPSchallenge. Percent surviving mice is calculated as: number of livingmice/total mice×100%.

[0568] Results

[0569] Effect of M-CIF in two animal models of septic shock in Balb/cmice

[0570] The first model of lethal shock was induced in mice with LPS (25mg/kg, i.p.). In this model, 85% of the animals died 52 hours after LPSinjection. M-CIF (3 mg/kg, i.p.) daily treatment for 3 days preventedlethality as much as 40% compared with the buffer control (FIG. 32). Thesecond model of lethal sepsis was induced by injecting mice with LPS (1ug/mouse, i.p.) one hour after D-gal (20 mg/mouse, i.p.) sensitizationand all animals died within 8 hours after LPS administration.Pretreatment of mice with M-CIF (1 mg/kg, i.p.) for 3 days in a similardosing regiment prevented 50% lethality in comparison with salinecontrol, and single dosing treatment only prevented lethality in 25% ofthe mice. In addition, the combination treatment of M-CIF with eitherLPS (1 ug/mouse) or D-gal (20 mg/mouse) caused no sign of morbidity andmoribundity in animals suggesting that the endotoxin level in M-CIFpreparation is negligible (Table 2). TABLE 2 Survival within M-CIF ipD-gal ip LPS ip NaCl ip 8 hr 11 hr 22 hr Group Strain 1 mg/kg 20 mg 1 ug0.1 ml living/total 1 BALB/c − + + −1, 0, +1 0/4 0/4 ND 2 BALB/c 0 + + −2/4 1/4 ND 3 BALB/c −1, 0, +1 + + − 2/4 2/4 ND 4 BALB/c −1, 0, +1 − + −4/4 4/4 ND 5 BALB/c −1, 0, +1 + − − 4/4 4/4 ND

[0571] Preventive effect of M-CIF on sepsis is independent of animalstrains

[0572] CF-1 mice were also used in the D-gal-sensitized LPS-inducedlethal shock model. Unlike Balb/c mice, only 50% of the CF-1 micesuffered from lethality by 11 hours post LPS in the saline control groupand additional M-CIF daily dosing for 3 consecutive days prevented allof the mice from dying (Table 3). These results suggest that human M-CIFmay be very close to the murine homologue and the protective effectM-CIF on sepsis is a broad phenomenon rather than animalstrain-selective. TABLE 3 Survival within M-CIF ip D-gal ip LPS ip NaClip 8 hr 11 hr 22 hr Group Strain 1 mg/kg 20 mg 1 ug 0.1 ml living/total1 CF-1 − + + −2, −1, 0 4/4 2/4 2/4 2 CF-1 −2, −1, 0 + + − 4/4 4/4 4/4 3CF-1 −2, −1, 0 − + − 5/5 5/5 5/5

[0573] Preventive effect of M-CIF on septic shock is dependent on LPSdose

[0574] In a large scale experiment, Balb/c mice were challenged i.p. onedose of LPS (25 mg/kg), and the degrees of lethality in this group was90% (FIG. 33). Pretreatment of M-CIF daily at 10 mg/kg for 3 consecutivedays protected as much as 70% (FIG. 36).

[0575] Dose-dependent effect of M-CIF on lethal sepsis

[0576] This large scale experiment was based on 25 mg/kg of LPS inBalb/c mice. 100% lethality was induced in the buffer control groupwithin 48 hours after LPS injection In contrast, there was still 40%survival in the mice treated with 1 mg/kg of M-CIF in the same period oftime and by day 5 all mice died in this group. Moreover, M-CIF at 3 and10 mg/kg doses prevented 50% and 65% of mice from lethal shock,respectively (FIG. 34).

[0577] M-CIF is capable of preventing sepsis in Balb/c SCID mice

[0578] SCID mice, which have a deficiency in B and T lymphocytes, wereinjected i.p. with 20, 30, 40 or 50 mg/kg of LPS to determine theoptimal degree of lethality. Unlike the normal Balb/c mice, no deathsoccured in the mice injected with 20 mg/kg LPS with or without M-CIFtreatment (n=8). Only 30% lethality was observed in the 30 mg/kg LPSgroup and additional treatment with 3 mg/kg of M-CIF protected all ofthe SCID mice from shock. As the LPS dose was futher increased to 40mg/kg, 80% mortality was induced in the buffer control group of theimmunodeficient mice and additional treatment of M-CIF at 3 mg/kg forthree consecutive days protected 40% of the mice from lethality (FIGS.35A and 35B). Once the LPS dose was given at 50 mg/kg, just like normalBalb/c mice, all of the SCID mice died in the buffer control groupwithin 24 hours; and none of the 5 animals could be protected byadditional M-CIF treatment.

[0579] Consistent protective effect of M-CIF from different vectorpreparations on sepsis

[0580] M-CIF proteins, prepared from E. coli and CHO expression vectorswere tested in LPS-induced lethal sepsis in Balb/c mice. Compared withthe buffer control which showed 100% lethality within 48 hours after 25mg/kg LPS challenge, M-CIF (1 mg/kg) derived from the CHO vector savedas much as 60% of the mice from death during the same time period and50% 3 days after LPS injection. Moreover, the same dose of the proteinfrom the E. Coli vector also prevented 25% of the mice from lethalshock. However, this preparation of M-CIF seems less potent than thematerials derived from the other two vectors, suggesting that there maybe a significant change during the protein expression and purificationprocess (FIG. 36).

Example 19

[0581] M-CIF Modulation in Renal Injury

[0582] TNF-α has been shown to be involved in the pathogenesis ofseveral types of glomerular injury (Martin, et al., Clin. Exp. Immunol.2:283-288 (1995); Ortiz, et al., Adv. Nephrol. Necker. Hosp. 24:53-77(1995); Karkar, et al., Kidney Int. 44:967-973 (1993); Nikolic-Paterson,et al., Kidney Int. 45:S79-S82 (1994); Egido, et al., Kidney Int.43:S59-S64 (1993)) and may play a role in tubulointerstitial nephritis,fibrosis, and renal allograft rejection (Baud, et al., Miner.Electrolyte Metab. 21:336-341 (1995); Tang, et al., Lab. Invest.70:631-638 (1994); Wilson, in The Kidney, Brenner, ed., Philadelphia, W.B. Saunders Company, p.1253 (1996); Perkins, et al., in The Kidney,Brenner, ed., Philadelphia, W. B. Saunders Company, p.2576 (1996)). Toinvestigate the efficacy of M-CIF in modifying the onset and progressionof renal diseases, animal models are utilized for crescenticglomerulonephritis, focal and segmental glomerulosclerosis (FSGS), anddrug induced interstitial nephritis.

[0583] A model of anti-GBM disease is induced in a strain of rats (WKY)particularly prone to the development of glomerular crescents (Huang etal., Kidney Int. 46:69-78 (1994); Bolton et al., Kidney Int. 44:294-306,(1993)). The antibody used in this study is produced in female NewZealand White rabbits. The rabbits are immunized repeatedly with thebasement membrane-rich sediment of kidney (Schreiner, et al., J. Exp.Med. 147:369-384 (1978)). The immune serum are heat-inactivated at 56°C. for 30 min and absorbed with rat red blood cells and the resultantserum called nephrotoxic serum (NTS). Normal male WKY rats (125-150 g)receive a single intravenous injection of a subnephritogenic dose ofNTS. The dose is chosen such that immediate glomerular injury is notcaused in Lewis rats.

[0584] According to known methods, administration of NTS to WKY ratscauses macrophages to infiltrate the glomeruli within 30 minutes and toincrease in number over a 10 day period. Glomerular hypercellularity isapparent within 48 hours and by day 6 there is necrosis and the presenceof early crescent formation. Ten days after administration of NTS themajority of the glomeruli will exhibit a diffuse and proliferativeglomerulonephritis.

[0585] To test the efficacy of M-CIF to alter disease progression, ratsreceive NTS and then are treated daily with an intraperitoneal injectionof M-CIF daily or placebo. The disease progression is monitored by dailycollection of urine and serum for assessment of proteinuria and TNF-alevels, respectively. At various time points ranging from 30 minutes to10 days after NTS administration, rats are sacrificed and the identityof the infiltrating cells is assessed by immunohistological examinationof frozen sections using commercially available monoclonal antibodiesspecific for macrophages and T cells.

[0586] A model of chronic aminonucleoside nephrosis is used as aprototype of progressive focal and segmental glomerulosclerosis. In thismodel, macrophages infiltrate the renal cortex in which are foundincreased levels of TNF-α and elevated expression of the endothelinreceptor gene (Diamond, et al., Am. J. Pathol. 141:887-894 (1992);Diamond et al., Lab. Invest. 64:21-28 (1991); Nakamura, et al., J. Am.Soc. Nephrol. 5:1585-1590 (1995)). Male Sprague-Dawley rats weighing125-150 g are used for these studies. These rats receive a singleintravenous injection of puromycin aminonucleoside (50 mg/kg; SigmaChemical Co, St. Louis, Mo.) through the right jugular vein over aperiod of 3 minutes. Within 2 weeks the animals develop proteinuria,severe tubulointerstitial abnormalities, and exhibit an influx ofmacrophages. This period of proteinuria will abate and then reappear by18 weeks at which time 44% of the glomeruli will exhibit focal andsegmental glomerulosclerosis (Diamond, et al., Kidney Int. 32:671-677(1987)).

[0587] To test the ability of M-CIF to prevent this progressive renalinjury, rats are injected intravenously with puromycin aminonucleosideand then treated with a daily intraperitoneal injection of either M-CIFor placebo. Proteinuria and serum levels of TNF-a are monitored atselected intervals over the 18 week study. At various time points ratsare sacrificed and the renal cortical infiltrate examined on sections ofkidneys using commercially available monoclonal antibodies tomacrophages and T cells. The degree of morphologic abnormalities areassessed on standard paraffin sections stained with hematoxylin andeosin by two individuals in a blinded fashion and by using acomputerized morphometric unit.

[0588] A model of cell-mediated immune injury to the renal tubulesleading to granuloma formation is used to evaluate the efficacy of M-CIFto ameliorate drug-induced interstitial nephritis. Male Brown Norwayrats weighing 140-180 g are used in this model as previously reported(Rennke, et al., Kidney Int. 45:1044-1056 (1994)). A haptenic molecule(ABA) is used as the target antigen. To produce the immunogen (ABA-KLH),31.4 mg of p-Arsanilic acid (Eastman Kodak Co., Rochester, N.Y.) aredissolved in 2.5 ml of 1N HCl and then diazotized by the slow additionof sodium nitrite, resulting in activated ABA. A solution of keyholelimpet hemocyanin (KLH) (Calbiochem Corp, La Jolla, Calif.) is preparedby dissolving 500 mg in 20 ml of borate buffered saline and the pH isadjusted to 9.2. The diazotized arsanilic acid is added slowly and after60 minutes the mixture dialyzed against phosphate buffered saline. Theresultant ABA-KLH is frozen in aliquots at −20° C. until use.

[0589] Rats are immunized subcutaneously at the base of tail with 1 mgof ABA-KLH emsulfied in complete Freund's adjuvant containing 5 mg/ml ofH37Ra mycobacterium tuberculosis (Difco laboratories, Detroit, Mich.).Ten days after this immunization, the left kidney is perfused throughthe renal artery successively with 1-2 ml of phosphate buffered saline,containing 0.05 mg/ml verapamil, 2 ml of activated ABA (4 mM solution inborate buffered saline solution at pH 8.1), and 1 ml of phosphatebuffered saline containing 0.05 mg/ml of verapamil.

[0590] To accomplish this, rats are anesthetized, placed on a heatedoperating table, and a laparatomy performed. The left renal vessels areisolated and loose snares placed around the left renal vein and theabdominal aorta. The left renal artery is cannulated with a 30 gaugeneedle and the snares around the aorta and renal vein closed. Ex vivoperfusion of the left kidney then occurs at a rate of 1.1 ml/min and theeffluent is then drained through a puncture of the temporarily ligatedleft renal vein. After hemostasis is restored and the ligaturesreleased, re-perfusion of the kidney occurs within 1-2 min. Within 24hours a mild but diffuse inflammatory cell infiltrate is produced thatis composed of polymorphonuclear leukocytes and mononuclear cells. Byday 5 monocytes and macrophages predominate. At this time (day 5), 75 %of the renal cortex is involved by a granulomatous inflammation.

[0591] To test the efficacy of M-CIF in this model, M-CIF or placebo isadministered intraperitoneally daily. Rats are sacrificed at varioustime points, their serum levels of TNF-α quantitated, and the amount ofrenal cortex involved in the inflammatory process estimated on standardparaffin sections stained with hematoxylin and eosin using acomputerized morphometric unit. The identity of the infiltratinginflammatory cells are identified on histological sections usingcommercially available monoclonal antibodies to monocytes/macrophagesand T cells. M-CIF is expected to provide reduced inflammation in renalinjuries.

Example 20

[0592] Protection of chronic joint inflammation in adjuvant arthritis inrats by M-CIF

[0593] In rheumatoid arthritis, pain and swelling can generally becontrolled by currently available drugs, but it has been difficult tohalt the progressive joint destruction associated with this disease.Therefore, much effort has been directed at more specific inhibition ofthe cellular and molecular mechanisms underlying bone and cartilagedestruction. The Freund's adjuvant-induced arthritis model in ratsshares a number of features with the arthritis patient, from thepresence of a proliferative synovitis and swelling of the extremitiesultimately leading to cartilage and bone erosion (Pearson & Wood,Arthritis Rheum. 2:440 (1959); Jones & Ward, Arthritis Rheum. 6:23(1963)). As in rheumatoid arthritis in humans, macrophages areabundantly present in the inflamed synovial membrane of rats withadjuvant arthritis (Johnson et al., Arthritis Rheum. 29:1122 (1986)).Macrophages are thought to play a major role in arthritis, either aseffector cells of tissue destruction, by secreting tissue-degradingenzymes or pro-inflammatory cytokines (Lopex-Bote et al., ArthritisRheum. 31:769 (1988)), or by virtue of their immunoregulatory functionsin the course of antigen-driven responses (Unanue & Allen, Science236:551 (1987). This animal model has been used for the detection ofanti-inflammatory and immunosuppressive drugs by quantitating hind-pawswelling (as a measure of acute inflammation), and histopathologicalalterations in cartilage and bone for chronic joint damage. In thisstudy, we have tested the effect of M-CIF on both acute and chronicinflammatory arthritis in the adjuvant arthritis rat model.

[0594] On day 0 adult male Lewis rats (120-150 g) were injectedintradermally at the base of the tail with Freund's complete adjuvant,which was prepared by adding Mycobacterium butyricum (Difco Lab,Detroit, Mich.) into mineral oil at a concentration of 5 mg/ml. M-CIF orits buffer were injected intraperitoneally to rats daily from day 0 today 16 or from day 0 to day 40 as described below. Indomethacin at adose of 1 mg/kg or its methylcellulose vehicle were orally administereddaily in other groups of rats. Swelling of the hindpaws were measuredusing a plethysmometer chamber (Baxco Electronics, Troy, N.Y.). Thehindpaw volume was expressed as the mean of the volumes of both hindpawsand as a percent change in paw volume.

[0595] At the end of experiment, the ankle and tarsal joints wereexcised and processed for histological evaluation. Two investigatorsevaluated the pathological changes and alterations of bone and cartilagein a blinded fashion using the following parameters: blood vesseldilation, fibrosis/fibroplasia, hyperplasia/hypertrophy, perivascularlymphoid aggregates, pannus formation, cartilage destruction, and bonedestruction. A subjective semiquantitive scoring system, used todifferentiate the degree and distribution of the changes, was defined asfollows: 0=normal; 0.5=slight; 1=moderate; 2=severe; and 3=very severe.

[0596] In the first experiment, the animals were treated from day 0 today 16. Their ankles were swollen by day 14 (the first time periodtested) and reached their maximal severity between day 16 and 20. Afterthis time the acute inflammation gradually subsided. The effect of M-CIFon ankle swelling is shown in FIG. 37. Both doses of M-CIF showedmoderate reduction in paw swelling, however indomethacin was much moreeffective in reducing the edema. In a pilot study the limbs from twoanimals from each group were processed for histopathological scoring andthe results are shown in FIG. 38. Taking both the acute and chronicfeatures into account, animals treated with M-CIF from day 0 to day 16showed a significant reduction in total joint inflammation compared withthe buffer control group.

[0597] Based on these results, a second experimental protocol wasutilized in which the rats were treated daily throughout the experiment(day 0 to day 40). At the end of the study, limbs from five animals pergroups were processed for histological evaluation. When M-CIF was givendaily at a dose of 3 mg/kg, there was significant reduction in thechronic synovitis (FIG. 39) and the bone and cartilage erosion (FIG. 40)when compared with its buffer controls. Indomethacin failed to show anyefficacy in the histopathology of chronic arthritis. Therefore, M-CIFshowed a significant protective effect on the chronic features ofarthritis, most importantly the bone and cartilage erosion, althoughonly a mild effect on acute edema.

[0598] M-CIF treatment prevents developing type II Collagen-inducedarthritis in DBA/1 mice

[0599] An emulsion was prepared using equal volumes of a 2 mg/mlsolution of bovine type II collagen and complete Freund's adjuvant.Female DBA/1LacJ mice, 5-6 weeks old were immunized intradermally at thebase of the tail with 100 μl of the emulsion. Eighteen days later, themice were divided into 3 groups of 10 mice and injectedintraperitoneally with 3 mg/ml of indomethacin, M-CIF, or a controlbufer. This injection was repeated for 14 days. Two days after the startof this treatment (which is 20 days after the start of the experiment),the mice were challenged with a s.c. injection of 60 μg of LPS in atotal volume of 100 μl. The animals were examined and their clinicalpresentation semiquantified for development of the arthritis by thefollowing scoring system:$\frac{{Incidence} = {{number}\quad {of}\quad {mice}\quad {with}\quad {at}\quad {least}\quad {one}\quad {affected}\quad {paw}}}{{total}\quad {number}\quad {of}\quad {mice}} \times 100$

Clinical severity score Description 0.5 One or more swollen digits. 1.0Entire paw swollen 2.0 Deformity observed afier inflammation subsides.3.0 Ankylosis: total loss of joint function in the paw.

[0600] As shown in FIG. 41, about 70% mice developed acute paw edema by4-10 days post LPS challenge in both M-CIF and its buffer treatedgroups. However, the severity of this acute inflammation is lesspronounced in M-CIF treated mice than that in the buffer group (FIG.42). Over time, the buffer treated group's incidence and severityincreased while M-CIF treated animals improved. Indomethacin, used aspositive control, was also effective in reducing both the incidence andseverity as expected.

[0601] Discussion

[0602] Adjuvant and collagen induced arthritis are widely usedexperimental models of rheumatoid arthritis with common clinical andhistological features. In rheumatoid arthritis, pain and swelling cangenerally be controlled by currently available drugs, but it has beendifficult to halt the progressive joint destruction associated with thisdisease. Therefore, much effort has been directed at more specificinhibition of the cellular and molecular mechanisms underlying bone andcartilage destruction. The protective effect of M-CIF on chronicfeatures of arthritis, most importantly the bone and cartilage erosionwhich leads to joint deformity and destruction strongly suggests thatM-CIF has good potential as a therapeutic agent for chronic inflammatoryarthritis such as rheumatoid arthritis in human. Although M-CIF only hasa mild effect on acute edema, combinational treatment of M-CIF and NSAIDmay be beneficial for both acute phase arthritis such as pain andswelling and the progressive joint destruction. Thus, M-CIF is shown toprovide protection against the chronic features of arthritis, such asinflammation and pain.

Example 21

[0603] Suppressive Effect of M-CIF on Systemic TNF-α Production

[0604] Septic shock is a disease with significant morbidity andmortality in humans, which results from uncontrollable release ofcytokines in response to blood-borne bacterial infection. Bacterialendotoxins are recognized as a major factor in the pathogenesis ofGram-negative septic shock (Morrison & Ryan, Annu. Rev. Med. 38:4171987; Wolff& Benett, N. Engl. J Med. 291:733 (1974). It appears to bemediated by macrophages in response to endotoxins for the production ofTNF-a and other cytokines (Freudenberg et al, Infect. Immun. 51:891(1986); Tracey et al., Nature (Lond). 330:662 (1987)).

[0605] Earlier work showed that systemic treatment of mice with M-CIFsignificantly prevented LPS-induced lethal shock in two animal models.Since TNF-a production is central in causing septic shock we askedwhether M-CIF interferes with the production of TNF-a and therebyprotects against TNF-mediated endotoxic shock in vivo.

[0606] In Vivo

[0607] Female Balb/c mice, 7-8 weeks old, were challenged with 25 mg/kgof lipopolysaccharide (LPS) from E. coli serotype 0127:B8 (SigmaChemical Co., St. Louis, Mo.) in saline on Day 0. M-CIF or its bufferwere administered intraperitoneally 1 day before and 1 hour before theLPS injection. Groups of 4 mice were sacrificed at 1, 2, and 4 hoursafter LPS administration. Sera was obtained from the retrorbital plexusand the TNF-a levels determined using an ELISA kit purchased fromGenzyme Corp., Cambridge, Mass. The assay was performed as described bythe manufacturer. Each sample was diluted 1:4 and assayed in duplicatewells and the results analyzed with an unpaired T test. Data areexpressed as mean values+SEM.

[0608] As shown in FIG. 43, serum TNF-a levels in the buffer controlgroup is highest at one hour post LPS injection and then quicklydeclines afterwards. In contrast, mice given 3 mg/kg of M-CIF hadsignificantly less TNF-a in their serum at one hour post LPS than thebuffer control group. Animals treated with 1 mg/kg of M-CIF had reducedlevels but this did not attain statistical significance.

[0609] The inhibitory effect of M-CIF on systemic TNF-a production isexpected to be one aspect of the mechanism by which M-CIF protects micefrom LPS-induced septic shock, and this effect would be beneficial fortreating autoimmune inflammatory diseases such as rheumatoid arthritisand osteroarthritis.

[0610] In vitro. Female Balb/c mice, 4-6 weeks old were put into 2groups of ten animals per group. The groups were either injectedintraperitonealy with vehicle control or injected with M-CIF at 3 mg/kgfor 2 consecutive days. One hour after the second injection, the micewere sacrificed and peritoneal cavity lavage performed to collect theresident cells. The cells were then washed and resuspended at a densityof 1×10⁶ cells/ml in culture medium (RPMI 1640/20% FBS). The cells werethen plated in 48 well plates and incubated overnight in the presence orabsence of LPS (1 and 10 ng/ml). After 18 hours, the supernatants fromeach well were collected and stored frozen until use. The ELISA for thedetermination of TNF-α content in the supernatants was performed asspecified by the manufacturer (Genzyme Diagnostics, Cambridge, Mass.).As seen in FIG. 44, cells isolated from M-CIF treated animals and thentreated with LPS in vitro secrete statistically significant loweramounts of TNF-α than do cells isolated from control mice.

[0611] M-CIF thus has the capacity to inhibit TNF-α production in vivo.This activity would be beneficial for both acute and chronicinflammation. Taken together with the data on the circulating TNF-αlevels presented above, this can explain one aspect of the mechanism bywhich M-CIF protects from LPS induced sepsis. Since increased levels ofTNF-α have been correlated with a wide variety of immune cell diseasesor reactions, M-CIF treatment could be used on such disease states, asdescribed herein.

[0612] Recent studies have shown the efficacy of inhibiting TNF-αactivity with the use of antibodies to TNF-α or soluble TNF-α receptors.These diseases include acute pancreatitis, allograft rejection,non-insulin dependent diabetes mellitus (NIDDM), asthma, delayedhypersensitivity reactions in the skin, pulmonary fibrosis, andischemia/reperfusion injury. In contrast, TNF-α plays a paracrine rolein liver regeneration and in some circumstances suppresses skin andcardiac allograft rejection. Thus, M-CIF or its agonists are expected tobe beneficial in such disease situations.

Example 22

[0613] M-CIF as a Chemoattractant for T-lymphocytes in vivo

[0614] Female Balb/c mice, 4-6 weeks old were put into 4 groups of tenanimals per group. The groups were either untreated, injectedintraperitoneally with vehicle control or injected with M-CIF at 1 mg/kgor 3 mg/kg for 6 consecutive days. On day seven, the mice weresacrificed and peritoneal cavity lavage performed to collect theresident cells. Total cell numbers were calculated and the cellssubjected to cell surface staining using the following panel ofmonoclonal antibodies: CD3, CD4, CD8, Mac1, GR1, B220, MHC class II,CD14, CD45, and CD5 (Pharmingen, San Diego, Calif.).

[0615] As shown in FIG. 45, the total cell numbers within the peritonealcavity increased 2-3 fold over untreated or vehicle treated controls.This appears to be due to an influx of T-lymphocytes as determined bycell surface staining for CD4, CD5, and CD8. There is a dramaticincrease in CD4 positive cells (FIG. 46) as well as CD5 and CD8 cellsresulting in a net increase in the relative number of T-lymphocytes(FIG. 47 (2)). In addition, there is a significant increase in Mac1positive, MHC class II negative, subpopulation of cells within theperitoneal cavity with a corresponding decrease in the percentage of MHCclass II positive, Mac1 positive subpopulation of cells (FIG. 48). Thisis also reflected in the total number of MHC class II negative, Mac1positive cells within the peritoneal cavity (FIG. 49).

[0616] M-CIF is thus shown to be a chemoattractant for T-lymphocytes invivo. This could be for CD4, CD8 or both subpopulations of T-cells.Based on this, M-CIF may be beneficial for disease states which wouldbenefit from the attraction and/or activation of this population ofimmune cells. This would include bacterial or viral infection, cancer,and the like. Also, if M-CIF has a specific effect on the Th1 or Th2subclass of CD4 lymphocytes, it could bias the normal production ofcytokines from these cells and dramatically influence other immune cellssuch as monocytes, macrophages, eosinophils, and other immune cells.

[0617] The fact that the MHC class II negative subpopulation of Mac1positive cells increases in the M-CIF treated animals suggests that themonocyte population within these animals consists of a higher percentageof non-activated cells. This is consistent with the data showing thatthe peritoneal cells from the M-CIF treated animals produce less TNF-ain response to LPS.

Example 23

[0618] In Vivo Stem Cell Mobilization Induced by MPIF-1

[0619] To demonstrate that MPIF-1 stimulates stem cell mobilization invivo, the following experiment was performed. Six mice were used foreach treatment group (C57Black 6/J, female, about 6 weeks old). Themicer were injected (I.P.) with either saline (vehicle control) orMPIF-1 at 5 μg/mouse. After 30 minutes, mice were bled and analyzed forWBC by Coulter counter. Then, blood from all six animals of each groupwas pooled and analyzed for the Gr.1+cells and CD34.Sca-1+doublepositive cells by FACScan. WBC counts are are expressed as Mean±S.D. andFACScan data as % of total cells. Since CD34.Sca-1+double positive cellsare thought to exhibit properties expected of the hematopoietic stemcells, the results shown in FIG. 50 illustrate that MPIF-1 can be usedas stem cell mobilzer.

Example 24

[0620] Purification of M-CIF

[0621] Purification from CHO Expression System

[0622] Following expression of M-CIF in Chinese hamster ovary cells, theprotein was purified using the following procedure. All of thepurification procedures were performed at 5-10° C., unless otherwisespecified. The transfected CHO cells were grown in HGS-CHO-3 mediumusing the microcarrier culture system (cytodex I, Pharmacia) for 4 days.The conditioned media were harvested using low speed centrifugation toremove cells and cell debris. After pH was adjusted to 7.0 with aceticacid, the conditioned media was loaded onto a strong cation exchangecolumn (Poros HS-50, Perseptive Biosystems Inc.) pre-equilibrated withphosphate buffered saline (PBS), pH 7.0. The column was then washed withsame buffer until the absorbance at 280 nm was less than 0.01 O.D. (10CV). The desired protein was eluted by washing the column with 1M NaClin phosphate buffered saline, pH 7.0. Fractions were then analyzed bySDS-PAGE through 4-20% gradient gels to confirm the presence of thedesired polypeptide.

[0623] Those fractions containing M-CIF were then pooled and loaded ontoa gel filtration column of Superdex-75 resin (Pharmacia) equilibrated in“sizing buffer” comprising 50 mM sodium acetate and 150 mM NaCl, pH 6.0.The sample loaded was less than 10% (V/V) of the column volume. Afterallowing the sample to run into the column, the protein was eluted fromthe gel filtration matrix using the same buffer. Fractions werecollected and the absorbance at 280 nm of the effluent was continuouslymonitored. Fractions identified by A280 as containing eluted materialwere then analyzed by SDS-PAGE. Fractions containing M-CIF was eluted ina peak centered at 0.62 column volumes and pooled.

[0624] The pooled fractions from gel filtration chromatography wasapplied onto a set of strong anion (Poros HQ-50, Perseptive Biosystems)and weak anion (Poros CM-20) exchange columns in a tandem mode. Bothcolumns were pre-equilibrated and washed with 50 mM sodium acetatebuffer, pH 6.0 after sample loading. The cation exchange column (CM-20)was then washed with 0.3M NaCl followed by a 0.3M to 0.8M NaCl gradientelution in the same buffer system. The eluted fractions were analyzedthrough SDS-PAGE and fractions containing protein of interest werecombined.

[0625] Following the purification steps described above, the resultantM-CIF was of greater than 95% purity as determined from Commassie bluestaining of a SDS-PAGE gel. The purified protein was also tested forendotoxin/LPS contamination. The LPS content was less than 0.1 ng/mg ofpurified protein according to LAL assays.

[0626] An alternative purification procedure was also used to purifyM-CIF. The procedure involves the following steps, and unless otherwisespecified, all procedures were conducted at 5-10° C.

[0627] Upon completion of the production phase of a CHO culture, theconditioned media were obtained after cells/cell debris removal usinglow speed centrifugation. Following pH of the media being adjusted to pH7.0 by adding acetic acid, the media were loaded onto a strong cationexchange column (Poros HS-50, Perspective Biosystems, Inc.)pre-equilibrated with phosphate buffered saline (PBS), pH 7.0. Thecolumn was then washed with same buffer until the absorbance at 280 nmwas less than 0.01 O.D. (10 CV). The desired protein was eluted bywashing the column with 1M NaCl in phosphate buffered saline, pH 7.0.Fractions were then analyzed by SDS-PAGE through 4-20% gradient gels toconfirm the presence of the M-CIF.

[0628] Those fractions containing M-CIF were then pooled, followed bythe addition of 4 volumes of 10 mM sodium acetate, pH 6.5. The dilutedsample was then loaded onto a previously prepared set of tandem columnsof strong anion (Poros HQ-50, Perseptive Biosystems) and weak anion(Poros CM-20, Perceptive Biosystems) exchange resin. The columns wereequilibrated with 50 mM sodium acetate pH 6.5. The CM-20 column waswashed with 5 column volumes of 0.2 M NaCl, 50 mM sodium acetate, pH 6.5and eluted using a 10 column volume linear gradient ranging from 0.2MNaCl, 50 mM sodium acetate, pH 6.5 to 1.OM NaCl 50 mM sodium acetate, pH6.5. Fractions were collected under constant A280 monitoring of theeffluent. Those fractions containing the protein of interest (determinedby 4-20% SDS-PAGE) were then pooled.

[0629] The combined fractions containing M-CIF were then loaded (V/V, 5%of the column volume) onto a sizing exclusion column (Superdex-75,Pharmacia) equilibrated with 100 mM NaCl, 50 mM sodium acetate, pH 6.5.After allowing the sample to run into the column, the protein was elutedfrom the gel filtration matrix using 100 mM NaCl, 50 mM sodium acetate,pH 6.5. Fractions were collected and the absorbance at 280 nm of theeffluent was continuously monitored. Fractions identified to A₂₈₀ ascontaining the eluted material were then analyzed by SDS-PAGE. Fractionscontaining M-CIF was then pooled.

[0630] Following the three step purification procedure described above,the resultant M-CIF was of greater than 95% purity as determined fromCommassie blue staining of a SDS-PAGE gel. The purified protein was alsotested for endotoxin/LPS contamination. The LPS content was less than0.1 ng/mg of purified protein according to LAL assays.

[0631] Purifcation of M-CIF from E. coli

[0632] The purification involves the following steps, and unlessotherwise specified, all procedures were conducted at 4-10° C.

[0633] Upon completion of the production phase of the E. colifermentation, the cell culture was cooled to 4-10° C. and the cells wereharvested by continuous centrifugation at 15,000 rpm (Heraeus Sepatech).On the basis of the expected yield of protein per unit weight of cellpaste and the amount of purified protein required, an appropriate amountof cell paste, by weight, was suspended in a buffer solution containing100 mM Tris, 50 mM EDTA, pH 7.4. The cells were dispersed to ahomogeneous solution using a high shear mixer.

[0634] The cells were then lysed by passing the solution throughmicrofluidizer (Microfuidics, Corp. or APV Gaulin, Inc.) twice at4000-6000 psi. The homogenate was then mixed with NaCl solution to afinal concentration of 0.5 M NaCl, followed by centrifugation at 7000 gfor 15 min. The resulted pellet was washed again using 0.5M NaCl, 100 mMTris, 50 mM EDTA, pH 7.4.

[0635] The washed inclusion body was solubilized with 1.5 M Guanidinehydrochloride (GuHCl) for 2-4 hours. After 7000 g centrifugation for 15min., pellet was discarded and the M-CIF-containing supernatant wasplaced at 4° C. overnight for further GuHCl extraction.

[0636] Following high speed centrifugation (30000 g) to remove theinsoluble particles, the GuHCl solubilized proteins were refolded byquickly mixing the GuHCl extraction with 20 volumes of buffer containing50 mM sodium, pH 4.5, 150 mM NaCl, 2 mM EDTA by vigorous stirring. Therefolded diluted protein solution was set kept at 4° C. without mixingfor 12 hours prior to further purification steps.

[0637] To clarify the refolded M-CIF solution, a previously preparedtangential filtration unit equipped with 0.16 um membrane filter withappropriate surface area (Filtron), equilibrated with 40 mM sodiumacetate, pH 6.0 was employed. The filtered sample was loaded onto acation exchange of poros HS-50 resin (Perseptive Biosystems). The columnwas washed with 40 mM sodium acetate, pH 6.0 and eluted with 250 mM, 500mM, 1000 mM, and 1500 mM NaCl in the same buffer, in a stepwise manner.The absorbance at 280 mm of the effluent was continuously monitored.Fractions were collected and further analyzed by SDS-PAGE.

[0638] Those fractions contained desired protein was then pooled andmixed with 4 volumes of water. The diluted sample was then loaded onto apreviously prepared set of tandem columns of strong anion (Poros HQ-50,Perseptive Biosystems) and weak anion (Poros CM-20, PerseptiveBiosystems) exchange resin. The columns were equilibrated with 40 mMsodium acetate, pH 6.0. Both columns were washed with 40 mM sodiumacetate, pH 6.0, 200 mM NaCl. The CM-20 column was then eluted using a10 column volume linear gradient ranging from 0.2M NaCl, 50 mM sodiumacetate, pH 6.0 to 1.0M NaCl, 50 mM sodium acetate, pH 6.5. Fractionswere collected under constant A280 monitoring of the effluent. Thosefractions containing the protein of interest (determined by 16%SDS-PAGE) were then pooled.

[0639] The resultant M-CIF was of greater than 95% purity after theabove refolding and purification steps. No major contaminant bands wasobserved from the Commassie blue stained 16% SDS-PAGE gel when 5 ug ofpurified protein was loaded. The purified protein was also tested forendotoxin/LPS contamination. The LPS content was less than 0.1 ng/mlaccording to LAL assays.

Example 25

[0640] M-CIF inhibits M-CSF-stimulated colony formation of human andmouse cells in a dose dependent manner

[0641] Progenitor cells are isolated and processed as described herein.Murine bone marrow cells are isolated from the femur and tibia, ficolseparated and depleted of plastic adherant cells. Both cell populationsare plated in agar containing medium in the presence of M-CSF (5 ng/ml)with or without M-CIF at the concentrations indicated. Data is expressedas mean number of colonies±S.D. from samples done in duplicate.

[0642] Clonogenic assays on mouse bone marrow cells

[0643] CFU-M colony formation assays is performed in a two-layered agarculture system. The bottom layer is prepared in 3.5 cm diameter tissueculture dishes with 1 ml of MEM medium supplemented with 20% FBS (SigmaTissue Culture Products, St. Louis, Mo.), 0.5% Difco agar and 15 ng/mlof M-CSF in the presence or absence of the indicated concentrations ofM-CIF or a control beta-family chemokine. This layer is then overlayedwith 0.5 ml of murine bone marrow cell suspension (10⁴ cells/dish)prepared in the agar medium described above except that it contained0.3% agar and no cytokines. The dishes are then incubated for seven daysin a tissue culture incubator (37° C., 88% N₂, 5% CO₂, and 7% O₂) andCFU-M colonies are scored under an inverted microscope.

[0644] Clonogenic assays on human CD34′ derived cells

[0645] Freshly purified CD34′ cells (5×10⁴ cells/ml) are cultured forfour days in Myelocult H5100 growth medium (Stem Cell Technologies Inc.,Vancouver, Canada) supplemented with human IL-3 (10 ng/ml) and human SCF(50 ng/ml). The resulting populations of committed hematopoieticprogenitors are counted and 1,000 cells in 1 ml of MethoCult medium(Stem Cell Technologies Inc., Vancouver, BC, Canada are plated in 3.5 cmdiameter tissue culture dishes with supplemented M-CSF (10 ng/ml) in thepresence or absence of the indicated concentrations of M-CIF or acontrol beta-family chemokine. After fourteen days in incubator (37° C.,88% N₂, 5% CO₂, and 7% O₂), the colonies are scored under an invertedmicroscope.

Example 26

[0646] Evaluation of M-CIF in a Surgically-Induced Model Osteoarthritisin Guinea Pigs

[0647] To demostrate that M-CIF slows the onset and progression ofosteoarthritis (OA), a surgically-induced model of OA in Hartley guineapig is used. The use of the guinea pig in experimental OA is awell-characterized, relevant and reproducible model of OA. This strainhas been shown to develop spontaneous osteoarthritis with age.Surgically-induced joint instability creates altered biomechanical loadsin the knee joint, leading to OA. Pathologic changes observed in thismodel are similar to those observed in human OA (Meacock, S. C. et al.,J. Exp. Pathol. 71(2):279-93 (1990), Bendele, A. M. et al., Vet Pathol.28:207-215 (1991), Jimenez, P. A. et al., Inflam. Res. 44(2):129-130(1995)).

[0648] Surgery is performed on eight week old male Hartley guinea pigs(n=5) anesthetized subcutaneously with ketamine (40 mg/kg), xylazine (5mg/kg), fentanyl (0.06 mg/kg) and post-operative buprenorphine (0.05mg/kg). Prior to surgery, guinea pigs are fasted for 12 hours. Animalsare kept on a heating pad during skin disinfection, surgery andpost-surgery. An incision is made with a #10 blade trough the jointcapsule of the right knee. The fascia over the medial meniscus isdissected, and the medial collateral ligament and medial incisionretracted. The anterior medial meniscus is isolated with a Tyrelmicro-dissecting hook and the anterior portion excised with a #15 blade.The joint capsule is sutured with continuous 5-0 Vicrylt. Two woundclips are used to close the skin and are then removed at 4 dayspost-surgery. The weights of the animals are determined at the beginningof the experiment and every two weeks thereafter.

[0649] M-CIF and placebo are administered daily (i.p) for six weekscommencing on the day of surgery. Used are: an untreated control, aplacebo group and M-CIF treated groups. Radiographs are taken at the endof the study prior to euthanasia. At the end of the experiment, allanimals are euthanized with an overdose of sodium pentobarbital (300mg/kg). The knee joints are harvested, fixed in 10% formalin for 4 daysand decalcified in 20% formic acid in PBS (pH 7.2) for 4 days. Sectionsare cut at 5 INSERT intervals and stained with Safranin 0, Fast Greenand Hematoxylin.

[0650] Histopathologic evaluation is performed using the Mankin scoringsystem (Mankin H. J., Orth. Clin. North America 2:19-30 (1971).

Example 27

[0651] Evaluation of M-CIF in a Peptidoglycan-Polysaccaride PolymerModel of Granulomatous Enterocolitis in Rats

[0652] To demonstrate that M-CIF would slow the onset and progression ofgranulomatous enterocolitis in a surgically-induced model of colitis inLewis rats is used. The use of the Lewis rat in experimental colitis isa well characterized, relevant and reproducible model of enterocolitis.The Lewis stain of rats has been shown to be susceptible to theenterocolitis following surgical implantation ofpeptidoglycan-polysaccharide (PG-PS) in various areas of the distalileum, peyer's patches, cecum and distal colon. Surgically-implantedPG-PS creates an acute enterocolits which peaks at 1-2 days, remainsquiescent for 7-9 days, and spontaneously reactivates by 12-17 days withan active inflammation which can persist for up to four months. (Elsonet al., Gastroenterol. 109:1344-1367 (1995)). Development of chronicinflammation is dependent on a T-cell mediated immune response, poorlydegradable PG-PS, and genetic host susceptibility (Sartor et al.,Methods:A Companion to Methods in Enzymology 9:233-247 (1996)). Imuneresponses observed in this model are similar to those observed in humanenterocolitis.

[0653] Surgery is performed on 130-170 g Lewis rats (n=10) anesthetizedsubcutaneously with ketamine (40 mg/kg), xylazine (5 mg/kg), fentanyl(0.06 mg/kg) and post-operative buprenorphine (0.05 mg/kg). Animals arekept on a heating pad during skin disinfection, surgery andpost-surgery. A 6-8 cm incision is made with a #10 blade through theabdomen to expose the ileum, cecum and colon. Rats are injectedintramurally (subserosally) with PG-APS (45 mINSERT g dry weight and 15mg rhamnose/g body wt). At each site 0.05 ml ({fraction (1/10)} of thetotal dose) is injected 2 and 4 cm proximal to the ileocecal valve, twodistal peyers patches, four midcecal sites, lymphoid aggregate at thececal tip, and removed at 4 days post-surgery. The weights of theanimals are determined at the beginning of the experiment and every fivedays thereafter. The extent of inflammation is assessed by morphologicalscoring of the extent of swelling of the ankle joint. Size of the anklejoint has been shown to be a reliable indicator of the presence ofinflamation in the intestines.

[0654] M-CIF and placebo will be administered (i.p.) daily for fourweeks comnmcing on the day of surgery. There will be an untreatedcontrol, a placebo group and M-CIF groups.

[0655] Two hours prior to euthanasia, rats are injected with BrdU (100mg/kg i.p.). At the end of the experiment, all animals are killed usingCO₂ asphyxiation. Samples taken from distal ileum, cecum and distalcolon are fixed in 10% formalin. Sections are cut and stained with H &E, mucicarmine, trichrome, and anti-BrdU antibodies. Histopathologicevaluation is performed using the Sartor scoring system. (Sartor, etal., Methods:A Companion to Methods in Enzymology 9:233-247 (1996).

[0656] It will be clear that the invention may be practiced otherwisethan as particularly described in the foregoing description andexamples.

[0657] Numerous modifications and variations of the present inventionare possible in light of the above teachings and, therefore, are withinthe scope of the appended claims.

[0658] The disclosures of all patents, patent applications, andpublications referred to herein are hereby incorporated by reference.

1 65 1 282 DNA Homo sapiens CDS (1)..(279) 1 atg aag atc tcc gtg gct gcaatt ccc ttc ttc ctc ctc atc acc atc 48 Met Lys Ile Ser Val Ala Ala IlePro Phe Phe Leu Leu Ile Thr Ile 1 5 10 15 gcc cta ggg acc aag act gaatcc tcc tca cgg gga cct tac cac ccc 96 Ala Leu Gly Thr Lys Thr Glu SerSer Ser Arg Gly Pro Tyr His Pro 20 25 30 tca gag tgc tgc ttc acc tac actacc tac aag atc ccg cgt cag cgg 144 Ser Glu Cys Cys Phe Thr Tyr Thr ThrTyr Lys Ile Pro Arg Gln Arg 35 40 45 att atg gat tac tat gag acc aac agccag tgc tcc aag ccc gga att 192 Ile Met Asp Tyr Tyr Glu Thr Asn Ser GlnCys Ser Lys Pro Gly Ile 50 55 60 gtc ttc atc acc aaa agg ggc cat tcc gtctgt acc aac ccc agt gac 240 Val Phe Ile Thr Lys Arg Gly His Ser Val CysThr Asn Pro Ser Asp 65 70 75 80 aag tgg gtc cag gac tat atc aag gac atgaag gag aac tga 282 Lys Trp Val Gln Asp Tyr Ile Lys Asp Met Lys Glu Asn85 90 2 93 PRT Homo sapiens 2 Met Lys Ile Ser Val Ala Ala Ile Pro PhePhe Leu Leu Ile Thr Ile 1 5 10 15 Ala Leu Gly Thr Lys Thr Glu Ser SerSer Arg Gly Pro Tyr His Pro 20 25 30 Ser Glu Cys Cys Phe Thr Tyr Thr ThrTyr Lys Ile Pro Arg Gln Arg 35 40 45 Ile Met Asp Tyr Tyr Glu Thr Asn SerGln Cys Ser Lys Pro Gly Ile 50 55 60 Val Phe Ile Thr Lys Arg Gly His SerVal Cys Thr Asn Pro Ser Asp 65 70 75 80 Lys Trp Val Gln Asp Tyr Ile LysAsp Met Lys Glu Asn 85 90 3 363 DNA Homo sapiens CDS (1)..(360) 3 atgaag gtc tcc gtg gct gcc ctc tcc tgc ctc atg ctt gtt act gcc 48 Met LysVal Ser Val Ala Ala Leu Ser Cys Leu Met Leu Val Thr Ala 1 5 10 15 cttgga tcc cag gcc cgg gtc aca aaa gat gca gag aca gag ttc atg 96 Leu GlySer Gln Ala Arg Val Thr Lys Asp Ala Glu Thr Glu Phe Met 20 25 30 atg tcaaag ctt cca ttg gaa aat cca gta ctt ctg gac aga ttc cat 144 Met Ser LysLeu Pro Leu Glu Asn Pro Val Leu Leu Asp Arg Phe His 35 40 45 gct act agtgct gac tgc tgc atc tcc tac acc cca cga agc atc ccg 192 Ala Thr Ser AlaAsp Cys Cys Ile Ser Tyr Thr Pro Arg Ser Ile Pro 50 55 60 tgt tca ctc ctggag agt tac ttt gaa acg aac agc gag tgc tcc aag 240 Cys Ser Leu Leu GluSer Tyr Phe Glu Thr Asn Ser Glu Cys Ser Lys 65 70 75 80 ccg ggt gtc atcttc ctc acc aag aag ggg cga cgt ttc tgt gcc aac 288 Pro Gly Val Ile PheLeu Thr Lys Lys Gly Arg Arg Phe Cys Ala Asn 85 90 95 ccc agt gat aag caagtt cag gtt tgc atg aga atg ctg aag ctg gac 336 Pro Ser Asp Lys Gln ValGln Val Cys Met Arg Met Leu Lys Leu Asp 100 105 110 aca cgg atc aag accagg aag aat tga 363 Thr Arg Ile Lys Thr Arg Lys Asn 115 120 4 120 PRTHomo sapiens 4 Met Lys Val Ser Val Ala Ala Leu Ser Cys Leu Met Leu ValThr Ala 1 5 10 15 Leu Gly Ser Gln Ala Arg Val Thr Lys Asp Ala Glu ThrGlu Phe Met 20 25 30 Met Ser Lys Leu Pro Leu Glu Asn Pro Val Leu Leu AspArg Phe His 35 40 45 Ala Thr Ser Ala Asp Cys Cys Ile Ser Tyr Thr Pro ArgSer Ile Pro 50 55 60 Cys Ser Leu Leu Glu Ser Tyr Phe Glu Thr Asn Ser GluCys Ser Lys 65 70 75 80 Pro Gly Val Ile Phe Leu Thr Lys Lys Gly Arg ArgPhe Cys Ala Asn 85 90 95 Pro Ser Asp Lys Gln Val Gln Val Cys Met Arg MetLeu Lys Leu Asp 100 105 110 Thr Arg Ile Lys Thr Arg Lys Asn 115 120 5270 DNA Homo sapiens CDS (1)..(267) 5 atg aag ggc ctt gca gct gcc ctcctt gtc ctc gtc tgc acc atg gcc 48 Met Lys Gly Leu Ala Ala Ala Leu LeuVal Leu Val Cys Thr Met Ala 1 5 10 15 ctc tgc tcc tgt gca caa gtt ggtacc aac aaa gag ctc tgc tgc ctc 96 Leu Cys Ser Cys Ala Gln Val Gly ThrAsn Lys Glu Leu Cys Cys Leu 20 25 30 gtc tat acc tcc tgg cag att cca caaaag ttc ata gtt gac tat tct 144 Val Tyr Thr Ser Trp Gln Ile Pro Gln LysPhe Ile Val Asp Tyr Ser 35 40 45 gaa acc agc ccc cag tgc ccc aag cca ggtgtc atc ctc cta acc aag 192 Glu Thr Ser Pro Gln Cys Pro Lys Pro Gly ValIle Leu Leu Thr Lys 50 55 60 aga ggc cgg cag atc tgt gct gac ccc aat aagaag tgg gtc cag aaa 240 Arg Gly Arg Gln Ile Cys Ala Asp Pro Asn Lys LysTrp Val Gln Lys 65 70 75 80 tac atc agc gac ctg aag ctg aat gcc tga 270Tyr Ile Ser Asp Leu Lys Leu Asn Ala 85 6 89 PRT Homo sapiens 6 Met LysGly Leu Ala Ala Ala Leu Leu Val Leu Val Cys Thr Met Ala 1 5 10 15 LeuCys Ser Cys Ala Gln Val Gly Thr Asn Lys Glu Leu Cys Cys Leu 20 25 30 ValTyr Thr Ser Trp Gln Ile Pro Gln Lys Phe Ile Val Asp Tyr Ser 35 40 45 GluThr Ser Pro Gln Cys Pro Lys Pro Gly Val Ile Leu Leu Thr Lys 50 55 60 ArgGly Arg Gln Ile Cys Ala Asp Pro Asn Lys Lys Trp Val Gln Lys 65 70 75 80Tyr Ile Ser Asp Leu Lys Leu Asn Ala 85 7 26 DNA Artificial SequenceDescription of Artificial Sequence cDNA 7 tcaggatccg tcacaaaaga tgcaga26 8 26 DNA Artificial Sequence Description of Artificial Sequence cDNA8 cgctctagag taaaacgacg gccagt 26 9 27 DNA Artificial SequenceDescription of Artificial Sequence cDNA 9 cccgcatgcg ggtcacaaaa gatgcag27 10 27 DNA Artificial Sequence Description of Artificial Sequence cDNA10 aaaggatcct caattcttcc tggtctt 27 11 48 DNA Artificial SequenceDescription of Artificial Sequence cDNA 11 acatgcatgc guguuaccaaagacgcugaa accgaauuca ugaugucc 48 12 36 DNA Artificial SequenceDescription of Artificial Sequence cDNA 12 gccgaagctt tcagtttttacgggttttga tacggg 36 13 88 DNA Artificial Sequence Description ofArtificial Sequence cDNA 13 gcatgcgugu uaccaaagac gcugaaaccg aauucaugauguccaaacug ccgcuggaaa 60 acccgguucu gcuggaccgu uuccacgc 88 14 104 DNAArtificial Sequence Description of Artificial Sequence cDNA 14gcuggaaucc uacuucgaaa ccaacuccga augcuccaaa ccggguguua ucuuccugac 60caaaaaaggu cgucguuucu gcgcuaaccc guccgacaaa cagg 104 15 89 DNAArtificial Sequence Description of Artificial Sequence cDNA 15aagctttcag tttttacggg tgggcagacg ggtgtccagt ttcagcatac gcatacaaac 60ctgaacctgt ttgtcggacg gcttagcgc 89 16 94 DNA Artificial SequenceDescription of Artificial Sequence cDNA 16 ggtttcgaag taggattccagcagggagca cgggatggaa cgcggggtgt aggagatgca 60 gcagtcagcg gaggtagcgtggaaacggtc cagc 94 17 32 DNA Artificial Sequence Description ofArtificial Sequence cDNA 17 gcgcagccat ggaaaacccg gttctgctgg ac 32 18 83PRT Homo sapiens 18 Met Glu Asn Pro Val Leu Leu Asp Arg Phe His Ala ThrSer Ala Asp 1 5 10 15 Cys Cys Ile Ser Tyr Thr Pro Arg Ser Ile Pro CysSer Leu Leu Glu 20 25 30 Ser Tyr Phe Glu Thr Asn Ser Glu Cys Ser Lys ProGly Val Ile Phe 35 40 45 Leu Thr Lys Lys Gly Arg Arg Phe Cys Ala Asn ProSer Asp Lys Gln 50 55 60 Val Gln Val Cys Met Arg Met Leu Lys Leu Asp ThrArg Ile Lys Thr 65 70 75 80 Arg Lys Asn 19 35 DNA Artificial SequenceDescription of Artificial Sequence cDNA 19 gccatggcat gctggaaaacccggttctgc tggac 35 20 84 PRT Homo sapiens 20 Met Leu Glu Asn Pro ValLeu Leu Asp Arg Phe His Ala Thr Ser Ala 1 5 10 15 Asp Cys Cys Ile SerTyr Thr Pro Arg Ser Ile Pro Cys Ser Leu Leu 20 25 30 Glu Ser Tyr Phe GluThr Asn Ser Glu Cys Ser Lys Pro Gly Val Ile 35 40 45 Phe Leu Thr Lys LysGly Arg Arg Phe Cys Ala Asn Pro Ser Asp Lys 50 55 60 Gln Val Gln Val CysMet Arg Met Leu Lys Leu Asp Thr Arg Ile Lys 65 70 75 80 Thr Arg Lys Asn21 32 DNA Artificial Sequence Description of Artificial Sequence cDNA 21gcgcagccat ggaccgtttc cacgctacct cc 32 22 77 PRT Homo sapiens 22 Met AspArg Phe His Ala Thr Ser Ala Asp Cys Cys Ile Ser Tyr Thr 1 5 10 15 ProArg Ser Ile Pro Cys Ser Leu Leu Glu Ser Tyr Phe Glu Thr Asn 20 25 30 SerGlu Cys Ser Lys Pro Gly Val Ile Phe Leu Thr Lys Lys Gly Arg 35 40 45 ArgPhe Cys Ala Asn Pro Ser Asp Lys Gln Val Gln Val Cys Met Arg 50 55 60 MetLeu Lys Leu Asp Thr Arg Ile Lys Thr Arg Lys Asn 65 70 75 23 29 DNAArtificial Sequence Description of Artificial Sequence cDNA 23gccatggcat gcgtttccac gctacctcc 29 24 76 PRT Homo sapiens 24 Met Arg PheHis Ala Thr Ser Ala Asp Cys Cys Ile Ser Tyr Thr Pro 1 5 10 15 Arg SerIle Pro Cys Ser Leu Leu Glu Ser Tyr Phe Glu Thr Asn Ser 20 25 30 Glu CysSer Lys Pro Gly Val Ile Phe Leu Thr Lys Lys Gly Arg Arg 35 40 45 Phe CysAla Asn Pro Ser Asp Lys Gln Val Gln Val Cys Met Arg Met 50 55 60 Leu LysLeu Asp Thr Arg Ile Lys Thr Arg Lys Asn 65 70 75 25 32 DNA ArtificialSequence Description of Artificial Sequence cDNA 25 gcgcagccatggctacctcc gctgactgct gc 32 26 73 PRT Homo sapiens 26 Met Ala Thr SerAla Asp Cys Cys Ile Ser Tyr Thr Pro Arg Ser Ile 1 5 10 15 Pro Cys SerLeu Leu Glu Ser Tyr Phe Glu Thr Asn Ser Glu Cys Ser 20 25 30 Lys Pro GlyVal Ile Phe Leu Thr Lys Lys Gly Arg Arg Phe Cys Ala 35 40 45 Asn Pro SerAsp Lys Gln Val Gln Val Cys Met Arg Met Leu Lys Leu 50 55 60 Asp Thr ArgIle Lys Thr Arg Lys Asn 65 70 27 21 DNA Artificial Sequence Descriptionof Artificial Sequence cDNA 27 ttcgaagtag gcttccagca g 21 28 21 DNAArtificial Sequence Description of Artificial Sequence cDNA 28ctgctggaag cctacttcga a 21 29 35 DNA Artificial Sequence Description ofArtificial Sequence cDNA 29 gccatggcat gcgtgttacc aaagacgctg aaacc 35 30100 PRT Homo sapiens 30 Met Arg Val Thr Lys Asp Ala Glu Thr Glu Phe MetMet Ser Lys Leu 1 5 10 15 Pro Leu Glu Asn Pro Val Leu Leu Asp Arg PheHis Ala Thr Ser Ala 20 25 30 Asp Cys Cys Ile Ser Tyr Thr Pro Arg Ser IlePro Cys Ser Leu Leu 35 40 45 Glu Ala Tyr Phe Glu Thr Asn Ser Glu Cys SerLys Pro Gly Val Ile 50 55 60 Phe Leu Thr Lys Lys Gly Arg Arg Phe Cys AlaAsn Pro Ser Asp Lys 65 70 75 80 Gln Val Gln Val Cys Met Arg Met Leu LysLeu Asp Thr Arg Ile Lys 85 90 95 Thr Arg Lys Asn 100 31 36 DNAArtificial Sequence Description of Artificial Sequence cDNA 31gcccaagctt tcagttttta cgggttttga tacggg 36 32 100 PRT Homo sapiens 32Met Arg Val Thr Lys Asp Ala Glu Thr Glu Phe Met Met Ser Lys Leu 1 5 1015 Pro Leu Glu Asn Pro Val Leu Leu Asp Arg Phe His Ala Thr Ser Ala 20 2530 Asp Cys Cys Ile Ser Tyr Thr Pro Arg Ser Ile Pro Cys Ser Leu Leu 35 4045 Glu Ser Tyr Phe Glu Thr Asn Ser Glu Cys Ser Lys Pro Gly Val Ile 50 5560 Phe Leu Thr Lys Lys Gly Arg Arg Phe Cys Ala Asn Pro Ser Asp Lys 65 7075 80 Gln Val Gln Val Cys Met Arg Met Leu Lys Leu Asp Thr Arg Ile Lys 8590 95 Thr Arg Lys Asn 100 33 27 DNA Artificial Sequence Description ofArtificial Sequence cDNA 33 tcaggatcct gtgcacaagt tggtacc 27 34 26 DNAArtificial Sequence Description of Artificial Sequence cDNA 34cgctctagag taaaacgacg gccagt 26 35 27 DNA Artificial SequenceDescription of Artificial Sequence cDNA 35 aaaaagcttt caggcattca gcttcag27 36 26 DNA Artificial Sequence Description of Artificial Sequence cDNA36 aaaccatggc acaagttggt accaac 26 37 30 DNA Artificial SequenceDescription of Artificial Sequence cDNA 37 gcccgcggat cctcctcacggggaccttac 30 38 32 DNA Artificial Sequence Description of ArtificialSequence cDNA 38 gcctgctcta gatcaaagca gggaagctcc ag 32 39 27 DNAArtificial Sequence Description of Artificial Sequence cDNA 39aaatcatgac caagactgaa tcctcct 27 40 27 DNA Artificial SequenceDescription of Artificial Sequence cDNA 40 aaaaagcttt cagttctcct tcatgtc27 41 27 DNA Artificial Sequence Description of Artificial Sequence cDNA41 ggaaagctta tgaaggtctc cgtggct 27 42 59 DNA Artificial SequenceDescription of Artificial Sequence cDNA 42 cgctctagat caagcgtagtctgggacgtc gtatgggtaa ttcttcctgg tcttgatcc 59 43 33 DNA ArtificialSequence Description of Artificial Sequence cDNA 43 aaaggatccgccaccatgaa ggtctccgtg gtc 33 44 27 DNA Artificial Sequence Descriptionof Artificial Sequence cDNA 44 aaaggatcct caattcttcc aggtctt 27 45 30DNA Artificial Sequence Description of Artificial Sequence cDNA 45ggaaagctta tgaagggcct tgcagctgcc 30 46 57 DNA Artificial SequenceDescription of Artificial Sequence cDNA 46 cgctctagat caabcgtagtctgggacgtc gtatgggtag gcattcagct tcaggtc 57 47 33 DNA ArtificialSequence Description of Artificial Sequence cDNA 47 aaaggatccgccaccatgaa gggccttgca agc 33 48 27 DNA Artificial Sequence Descriptionof Artificial Sequence cDNA 48 aaaggatcct caggcattca gcttcag 27 49 28DNA Artificial Sequence Description of Artificial Sequence cDNA 49ggaaagctta tgaagattcc gtggctgc 28 50 58 DNA Artificial SequenceDescription of Artificial Sequence cDNA 50 cgctctagat caagcgtagtctgggacgtc gtatgggtag ttctccttca tgtccttg 58 51 33 DNA ArtificialSequence Description of Artificial Sequence cDNA 51 aaaggatccgccaccatgaa gatctccgtg gct 33 52 30 DNA Artificial Sequence Descriptionof Artificial Sequence cDNA 52 aaaggatcct cagttctcct tcatgtcctt 30 53 92PRT Homo sapiens 53 Met Gln Val Ser Thr Ala Ala Leu Ala Val Leu Leu CysThr Met Ala 1 5 10 15 Leu Cys Asn Gln Phe Ser Ala Ser Leu Ala Ala AspThr Pro Thr Ala 20 25 30 Cys Cys Phe Ser Tyr Thr Ser Arg Gln Ile Pro GlnAsn Phe Ile Ala 35 40 45 Asp Tyr Phe Glu Thr Ser Ser Gln Cys Ser Lys ProGly Val Ile Phe 50 55 60 Leu Thr Lys Arg Ser Arg Gln Val Cys Ala Asp ProSer Glu Glu Trp 65 70 75 80 Val Gln Lys Tyr Val Ser Asp Leu Glu Leu SerAla 85 90 54 100 PRT Homo sapiens 54 Met Arg Val Thr Lys Asp Ala Glu ThrGlu Phe Met Met Ser Lys Leu 1 5 10 15 Pro Leu Glu Asn Pro Val Leu LeuAsp Arg Phe His Ala Thr Ser Ala 20 25 30 Asp Cys Cys Ile Ser Tyr Thr ProArg Ser Ile Pro Cys Ser Leu Leu 35 40 45 Glu Ser Tyr Phe Glu Thr Asn SerGlu Cys Ser Lys Pro Gly Val Ile 50 55 60 Phe Leu Thr Lys Lys Gly Arg ArgPhe Cys Ala Asn Pro Ser Asp Lys 65 70 75 80 Gln Val Gln Val Cys Met ArgMet Leu Lys Leu Asp Thr Arg Ile Lys 85 90 95 Thr Arg Lys Asn 100 55 75PRT Homo sapiens 55 Arg Phe His Ala Thr Ser Ala Asp Cys Cys Ile Ser TyrThr Pro Arg 1 5 10 15 Ser Ile Pro Cys Ser Leu Leu Glu Ser Tyr Phe GluThr Asn Ser Glu 20 25 30 Cys Ser Lys Pro Gly Val Ile Phe Leu Thr Lys LysGly Arg Arg Phe 35 40 45 Cys Ala Asn Pro Ser Asp Lys Gln Val Gln Val CysMet Arg Met Leu 50 55 60 Lys Leu Asp Thr Arg Ile Lys Thr Arg Lys Asn 6570 75 56 76 PRT Homo sapiens 56 Asp Arg Phe His Ala Thr Ser Ala Asp CysCys Ile Ser Tyr Thr Pro 1 5 10 15 Arg Ser Ile Pro Cys Ser Leu Leu GluSer Tyr Phe Glu Thr Asn Ser 20 25 30 Glu Cys Ser Lys Pro Gly Val Ile PheLeu Thr Lys Lys Gly Arg Arg 35 40 45 Phe Cys Ala Asn Pro Ser Asp Lys GlnVal Gln Val Cys Met Arg Met 50 55 60 Leu Lys Leu Asp Thr Arg Ile Lys ThrArg Lys Asn 65 70 75 57 73 PRT Homo sapiens 57 His Ala Thr Ser Ala AspCys Cys Ile Ser Tyr Thr Pro Arg Ser Ile 1 5 10 15 Pro Cys Ser Leu LeuGlu Ser Tyr Phe Glu Thr Asn Ser Glu Cys Ser 20 25 30 Lys Pro Gly Val IlePhe Leu Thr Lys Lys Gly Arg Arg Phe Cys Ala 35 40 45 Asn Pro Ser Asp LysGln Val Gln Val Cys Met Arg Met Leu Lys Leu 50 55 60 Asp Thr Arg Ile LysThr Arg Lys Asn 65 70 58 72 PRT Homo sapiens 58 Ala Thr Ser Ala Asp CysCys Ile Ser Tyr Thr Pro Arg Ser Ile Pro 1 5 10 15 Cys Ser Leu Leu GluSer Tyr Phe Glu Thr Asn Ser Glu Cys Ser Lys 20 25 30 Pro Gly Val Ile PheLeu Thr Lys Lys Gly Arg Arg Phe Cys Ala Asn 35 40 45 Pro Ser Asp Lys GlnVal Gln Val Cys Met Arg Met Leu Lys Leu Asp 50 55 60 Thr Arg Ile Lys ThrArg Lys Asn 65 70 59 76 PRT Homo sapiens 59 Met Arg Phe His Ala Thr SerAla Asp Cys Cys Ile Ser Tyr Thr Pro 1 5 10 15 Arg Ser Ile Pro Cys SerLeu Leu Glu Ser Tyr Phe Glu Thr Asn Ser 20 25 30 Glu Cys Ser Lys Pro GlyVal Ile Phe Leu Thr Lys Lys Gly Arg Arg 35 40 45 Phe Cys Ala Asn Pro SerAsp Lys Gln Val Gln Val Cys Met Arg Met 50 55 60 Leu Lys Leu Asp Thr ArgIle Lys Thr Arg Lys Asn 65 70 75 60 82 PRT Homo sapiens 60 Glu Asn ProVal Leu Leu Asp Arg Phe His Ala Thr Ser Ala Asp Cys 1 5 10 15 Cys IleSer Tyr Thr Pro Arg Ser Ile Pro Cys Ser Leu Leu Glu Ser 20 25 30 Tyr PheGlu Thr Asn Ser Glu Cys Ser Lys Pro Gly Val Ile Phe Leu 35 40 45 Thr LysLys Gly Arg Arg Phe Cys Ala Asn Pro Ser Asp Lys Gln Val 50 55 60 Gln ValCys Met Arg Met Leu Lys Leu Asp Thr Arg Ile Lys Thr Arg 65 70 75 80 LysAsn 61 77 PRT Homo sapiens 61 Leu Asp Arg Phe His Ala Thr Ser Ala AspCys Cys Ile Ser Tyr Thr 1 5 10 15 Pro Arg Ser Ile Pro Cys Ser Leu LeuGlu Ser Tyr Phe Glu Thr Asn 20 25 30 Ser Glu Cys Ser Lys Pro Gly Val IlePhe Leu Thr Lys Lys Gly Arg 35 40 45 Arg Phe Cys Ala Asn Pro Ser Asp LysGln Val Gln Val Cys Met Arg 50 55 60 Met Leu Lys Leu Asp Thr Arg Ile LysThr Arg Lys Asn 65 70 75 62 78 PRT Homo sapiens 62 His Ala Ala Gly PheHis Ala Thr Ser Ala Asp Cys Cys Ile Ser Tyr 1 5 10 15 Thr Pro Arg SerIle Pro Cys Ser Leu Leu Glu Ser Tyr Phe Glu Thr 20 25 30 Asn Ser Glu CysSer Lys Pro Gly Val Ile Phe Leu Thr Lys Lys Gly 35 40 45 Arg Arg Phe CysAla Asn Pro Ser Asp Lys Gln Val Gln Val Cys Met 50 55 60 Arg Met Leu LysLeu Asp Thr Arg Ile Lys Thr Arg Lys Asn 65 70 75 63 599 DNA Homo sapiensCDS (35)..(445) 63 gtcctccggc cagccctgcc tgcccaccag gagg atg aag gtc tccgtg gct gcc 55 Met Lys Val Ser Val Ala Ala 1 5 ctc tcc tgc ctc atg cttgtt act gcc ctt ggc tcc cag gcc cgg gtc 103 Leu Ser Cys Leu Met Leu ValThr Ala Leu Gly Ser Gln Ala Arg Val 10 15 20 aca aaa gat gca gag aca gagttg acg atg tca aag ctt cca ttg gaa 151 Thr Lys Asp Ala Glu Thr Glu LeuThr Met Ser Lys Leu Pro Leu Glu 25 30 35 aat cca gta ctt ctg gac atg ctctgg agg aga aag att ggt cct cag 199 Asn Pro Val Leu Leu Asp Met Leu TrpArg Arg Lys Ile Gly Pro Gln 40 45 50 55 atg acc ctt tct cat gcc gca ggattc cat gct act agt gct gac tgc 247 Met Thr Leu Ser His Ala Ala Gly PheHis Ala Thr Ser Ala Asp Cys 60 65 70 tgc atg tcc tac acc cca cga agc atcccg tgt tca ctc ctg gag agt 295 Cys Met Ser Tyr Thr Pro Arg Ser Ile ProCys Ser Leu Leu Glu Ser 75 80 85 tac ttt gaa acg aac agc gag tgc tcc aagccg ggt gtc atc ttc ctc 343 Tyr Phe Glu Thr Asn Ser Glu Cys Ser Lys ProGly Val Ile Phe Leu 90 95 100 acc aag aag ggg cga cgt ttc tgt gcc aacccc agt gat aag caa gtt 391 Thr Lys Lys Gly Arg Arg Phe Cys Ala Asn ProSer Asp Lys Gln Val 105 110 115 cag gtt tgc atg aga atg ctg aag ctg gacaca cgg atc aag acc agg 439 Gln Val Cys Met Arg Met Leu Lys Leu Asp ThrArg Ile Lys Thr Arg 120 125 130 135 aag aat tgaacttgtc aaggtgaaggggacacaagt tgccagccac caactttctt 495 Lys Asn gcctcaacta acttcctgaattcttttttt aagaagcatt tattcttgtg ttctggattt 555 agagcaattc atcttttctcacctttaaaa aaaaaaaaaa aaaa 599 64 137 PRT Homo sapiens 64 Met Lys ValSer Val Ala Ala Leu Ser Cys Leu Met Leu Val Thr Ala 1 5 10 15 Leu GlySer Gln Ala Arg Val Thr Lys Asp Ala Glu Thr Glu Leu Thr 20 25 30 Met SerLys Leu Pro Leu Glu Asn Pro Val Leu Leu Asp Met Leu Trp 35 40 45 Arg ArgLys Ile Gly Pro Gln Met Thr Leu Ser His Ala Ala Gly Phe 50 55 60 His AlaThr Ser Ala Asp Cys Cys Met Ser Tyr Thr Pro Arg Ser Ile 65 70 75 80 ProCys Ser Leu Leu Glu Ser Tyr Phe Glu Thr Asn Ser Glu Cys Ser 85 90 95 LysPro Gly Val Ile Phe Leu Thr Lys Lys Gly Arg Arg Phe Cys Ala 100 105 110Asn Pro Ser Asp Lys Gln Val Gln Val Cys Met Arg Met Leu Lys Leu 115 120125 Asp Thr Arg Ile Lys Thr Arg Lys Asn 130 135 65 70 PRT Homo sapiens65 Met Ala Gln Val Gly Thr Asn Lys Glu Leu Cys Cys Leu Val Tyr Thr 1 510 15 Ser Trp Gln Ile Pro Gln Lys Phe Ile Val Asp Tyr Ser Glu Thr Ser 2025 30 Pro Gln Cys Pro Lys Pro Gly Val Met Leu Leu Thr Lys Arg Gly Arg 3540 45 Gln Ile Cys Ala Asp Pro Asn Lys Lys Trp Val Gln Lys Tyr Ile Ser 5055 60 Asp Leu Lys Leu Asn Ala 65 70

What is claimed is:
 1. An isolated nucleic acid molecule comprising apolynucleotide having a nucleotide sequence at least 95% identical to asequence selected from the group consisting of: (a) a nucleotidesequence encoding the MPIF-1 polypeptide having the complete amino acidsequence in FIG. 1 (SEQ ID NO:4) (b) a nucleotide sequence encoding themature MPIF-1 polypeptide having the amino acid sequence at positions22-120 in FIG. 1 (SEQ ID NO:4); (c) a nucleotide sequence encoding theMPIF-1 polypeptide having the complete amino acid sequence encoded bythe cDNA clone contained in ATCC Deposit No. 75676; (d) a nucleotidesequence encoding the mature MPIF-1 polypeptide having the amino acidsequence encoded by the cDNA clone contained in ATCC Deposit No. 75676;and (e) a nucleotide sequence complementary to any of the nucleotidesequences in (a), (b), (c) or (d).
 2. The nucleic acid molecule of claim1 wherein said polynucleotide has the complete nucleotide sequence inFIG. 1 (SEQ ID NO:4).
 3. The nucleic acid molecule of claim 1 whereinsaid polynucleotide has the nucleotide sequence in FIG. 1 (SEQ ID NO:4)encoding the MPIF-1 polypeptide having the complete amino acid sequencein FIG. 1 (SEQ ID NO:4).
 4. The nucleic acid molecule of claim 1 whereinsaid polynucleotide has the nucleotide sequence in FIG. 1 (SEQ ID NO:4)encoding the mature MPIF-1 polypeptide having the amino acid sequence inFIG. 1 (SEQ ID NO:4).
 5. The nucleic acid molecule of claim 1 whereinsaid polynucleotide has the complete nucleotide sequence of the cDNAclone contained in ATCC Deposit No.
 75676. 6. The nucleic acid moleculeof claim 1 wherein said polynucleotide has the nucleotide sequenceencoding the MPIF-1 polypeptide having the complete amino acid sequenceencoded by the cDNA clone contained in ATCC Deposit No.
 75676. 7. Thenucleic acid molecule of claim 1 wherein said polynucleotide has thenucleotide sequence encoding the mature MPIF-1 polypeptide having theamino acid sequence encoded by the cDNA clone contained in ATCC DepositNo.
 75676. 8. An isolated nucleic acid molecule comprising apolynucleotide which hybridizes under stringent hybridization conditionsto a polynucleotide having a nucleotide sequence identical to anucleotide sequence in (a), (b), (c), (d) or (e) of claim 1 wherein saidpolynucleotide which hybridizes does not hybridize under stringenthybridization conditions to a polynucleotide having a nucleotidesequence consisting of only A residues or of only T residues.
 9. Anisolated nucleic acid molecule comprising a polynucleotide which encodesthe amino acid sequence of an epitope-bearing portion of a MPIF-1polypeptide having an amino acid sequence in (a), (b), (c) or (d) ofclaim
 1. 10. The isolated nucleic acid molecule of claim 9, whichencodes an epitope-bearing portion of a MPIF-1 polypeptide selected fromthe group consisting of: a polypeptide comprising amino acid residuesfrom about 21 to about 30 in FIG. 1 (SEQ ID NO:4); a polypeptidecomprising amino acid residues from about 31 to about 44 in FIG. 1 (SEQID NO:4); a polypeptide comprising amino acid residues from about 49 toabout 55 in FIG. 1 (SEQ ID NO:4); a polypeptide comprising amino acidresidues from about 59 to about 67 in FIG. 1 (SEQ ID NO:4); apolypeptide comprising amino acid residues from about 72 to about 83 inFIG. 1 (SEQ ID NO:4); a polypeptide comprising amino acid residues fromabout 86 to about 103 in FIG. 1 (SEQ ID NO:4); and a polypeptidecomprising amino acid residues from about 110 to about 120 in FIG. 1(SEQ ID NO:4).
 11. A method for making a recombinant vector comprisinginserting an isolated nucleic acid molecule of claim 1 into a vector.12. A recombinant vector produced by the method of claim
 11. 13. Amethod of making a recombinant host cell comprising introducing therecombinant vector of claim 12 into a host cell.
 14. A recombinant hostcell produced by the method of claim
 13. 15. A recombinant method forproducing a MPIF-1 polypeptide, comprising culturing the recombinanthost cell of claim 14 under conditions such that said polypeptide isexpressed and recovering said polypeptide.
 16. An isolated MPIF-1polypeptide having an amino acid sequence at least 95% identical to asequence selected from the group consisting of: (a) the amino acidsequence of the MPIF-1 polypeptide having the complete amino acidsequence in FIG. 1 (SEQ ID NO:4); (b) the amino acid sequence of themature MPIF-1 polypeptide having the amino acid sequence at positions22-120 in FIG. 1 (SEQ ID NO:4); (c) the amino acid sequence of theMPIF-1 polypeptide having the complete amino acid sequence encoded bythe cDNA clone contained in ATCC Deposit No.75676; (d) the amino acidsequence of the mature MPIF-1 polypeptide having the amino acid sequenceencoded by the cDNA clone contained in ATCC Deposit No. 75676; and (e)the amino acid sequence of an epitope-bearing portion of any one of thepolypeptides of (a), (b), (c), or (d).
 17. An isolated polypeptidecomprising an epitope-bearing portion of the MPIF-1 protein, whereinsaid portion is selected from the group consisting of: a polypeptidecomprising amino acid residues from about 21 to about 30 in FIG. 1 (SEQID NO:4); a polypeptide comprising amino acid residues from about 31 toabout 44 in FIG. 1 (SEQ ID NO:4); a polypeptide comprising amino acidresidues from about 49 to about 55 in FIG. 1 (SEQ ID NO:4);a polypeptidecomprising amino acid residues from about 59 to about 67 in FIG. 1 (SEQID NO:4);a polypeptide comprising amino acid residues from about 72 toabout 83 in FIG. 1 (SEQ ID NO:4);a polypeptide comprising amino acidresidues from about 86 to about 103 in FIG. 1 (SEQ ID NO:4); and apolypeptide comprising amino acid residues from about 110 to about 120in FIG. 1 (SEQ ID NO:4).
 18. An isolated antibody that bindsspecifically to a MPIF-1 polypeptide of claim
 16. 19. A method ofmyeloprotection comprising adminstering an effective amount of thepolypeptide as claimed in claim 16 to a patient undergoing chemotherapy.20. A method of ex vivo expansion of hematopoietic stem cells comprisingcontacting bone marrow with an effective amount of the polypeptide ofclaim 16 to improve colony formation.
 21. A method of inhibitingproliferation of leukemia cells comprising administering to said cellsan effective amount of the polypeptide of claim
 16. 22. A method ofinducing monocytes to secrete tumor inhibiting agents comprisingcontacting said cells with an effective amount of the polypeptide ofclaim
 16. 23. A method of protecting LPP-CFC cells comprising contactingsaid cells with an effective amount of the polypeptide of claim 16.